Guan, Xungui On the Diophantine equation \(X^2 - (a^2 + 1)Y^4 = k^2 - 1 - 2ka\). (Chinese. English summary) Zbl 1488.11081 J. Sichuan Norm. Univ., Nat. Sci. 44, No. 2, 225-234 (2021). MSC: 11D25 11J68 PDFBibTeX XMLCite \textit{X. Guan}, J. Sichuan Norm. Univ., Nat. Sci. 44, No. 2, 225--234 (2021; Zbl 1488.11081) Full Text: DOI
Xing, Chaoping A survey on locally repairable codes. (Chinese. English summary) Zbl 1488.94120 J. Sichuan Norm. Univ., Nat. Sci. 44, No. 2, 143-155 (2021). MSC: 94B60 68P30 11T71 PDFBibTeX XMLCite \textit{C. Xing}, J. Sichuan Norm. Univ., Nat. Sci. 44, No. 2, 143--155 (2021; Zbl 1488.94120) Full Text: DOI
Deng, Guilin; Liao, Qunying The solvability of the equation \({\varphi_e}(n) = {p^{t\omega (n)}}(e = 2, 3, 4, 6)\). (Chinese. English summary) Zbl 1474.11008 J. Sichuan Norm. Univ., Nat. Sci. 44, No. 1, 18-22 (2021). MSC: 11A25 PDFBibTeX XMLCite \textit{G. Deng} and \textit{Q. Liao}, J. Sichuan Norm. Univ., Nat. Sci. 44, No. 1, 18--22 (2021; Zbl 1474.11008) Full Text: DOI
Liao, Qunying The recurrence formulae for two classes of generalized Euler functions. (Chinese. English summary) Zbl 1474.11010 J. Sichuan Norm. Univ., Nat. Sci. 43, No. 6, 739-746 (2020). MSC: 11A25 PDFBibTeX XMLCite \textit{Q. Liao}, J. Sichuan Norm. Univ., Nat. Sci. 43, No. 6, 739--746 (2020; Zbl 1474.11010) Full Text: DOI
Zhu, Jie; Liao, Qunying On positive integer solutions for the equation \(Z(n) = {\varphi_e}({\mathrm{SL}}(n))\). (Chinese. English summary) Zbl 1463.11015 J. Sichuan Norm. Univ., Nat. Sci. 43, No. 4, 451-457 (2020). MSC: 11A25 11B68 PDFBibTeX XMLCite \textit{J. Zhu} and \textit{Q. Liao}, J. Sichuan Norm. Univ., Nat. Sci. 43, No. 4, 451--457 (2020; Zbl 1463.11015) Full Text: DOI
Deng, Guilin; Liao, Qunying The solvability of the equation \({\varphi_e} (n) = 2^{t\omega (n)}\). (Chinese. English summary) Zbl 1463.11006 J. Sichuan Norm. Univ., Nat. Sci. 43, No. 2, 187-201 (2020). MSC: 11A25 11B68 11Y70 PDFBibTeX XMLCite \textit{G. Deng} and \textit{Q. Liao}, J. Sichuan Norm. Univ., Nat. Sci. 43, No. 2, 187--201 (2020; Zbl 1463.11006) Full Text: DOI
Hu, Shuangnian; Li, Yanyan; Zhu, Yuqing; Niu, Yujun The divisibility of the determinants of the Smith matrices on multiple coprime GCD-closed sets. (Chinese. English summary) Zbl 1463.15021 J. Sichuan Norm. Univ., Nat. Sci. 43, No. 1, 45-49 (2020). MSC: 15A15 15B36 11C20 PDFBibTeX XMLCite \textit{S. Hu} et al., J. Sichuan Norm. Univ., Nat. Sci. 43, No. 1, 45--49 (2020; Zbl 1463.15021)
Liao, Qunying The explicit formula for a special class of generalized Euler functions. (Chinese. English summary) Zbl 1449.11007 J. Sichuan Norm. Univ., Nat. Sci. 42, No. 3, 354-357 (2019). MSC: 11A25 11B68 PDFBibTeX XMLCite \textit{Q. Liao}, J. Sichuan Norm. Univ., Nat. Sci. 42, No. 3, 354--357 (2019; Zbl 1449.11007) Full Text: DOI
Wang, Rong; Liao, Qunying On the generalized Euler function \(\varphi_5(n)\). (Chinese. English summary) Zbl 1424.11011 J. Sichuan Norm. Univ., Nat. Sci. 41, No. 4, 445-449 (2018). MSC: 11A25 PDFBibTeX XMLCite \textit{R. Wang} and \textit{Q. Liao}, J. Sichuan Norm. Univ., Nat. Sci. 41, No. 4, 445--449 (2018; Zbl 1424.11011) Full Text: DOI
Wan, Daqing Zeta functions of \(\mathbb{Z}_p\)-towers of curves. (English) Zbl 1424.11135 J. Sichuan Norm. Univ., Nat. Sci. 41, No. 4, 427-438 (2018). MSC: 11M41 11G20 14G10 PDFBibTeX XMLCite \textit{D. Wan}, J. Sichuan Norm. Univ., Nat. Sci. 41, No. 4, 427--438 (2018; Zbl 1424.11135) Full Text: DOI arXiv
Bai, Hairong; Liao, Qunying Some generalizations of Smarandache function. (Chinese. English summary) Zbl 1399.11069 J. Sichuan Norm. Univ., Nat. Sci. 41, No. 1, 32-38 (2018). MSC: 11B83 PDFBibTeX XMLCite \textit{H. Bai} and \textit{Q. Liao}, J. Sichuan Norm. Univ., Nat. Sci. 41, No. 1, 32--38 (2018; Zbl 1399.11069) Full Text: DOI
Feng, Qian; Liao, Qunying Near-perfect numbers of the form \(n={2^{\alpha-1}}{p_1}{p_2}{p_3}\). (Chinese. English summary) Zbl 1399.11020 J. Sichuan Norm. Univ., Nat. Sci. 41, No. 1, 15-18 (2018). MSC: 11A41 11N80 PDFBibTeX XMLCite \textit{Q. Feng} and \textit{Q. Liao}, J. Sichuan Norm. Univ., Nat. Sci. 41, No. 1, 15--18 (2018; Zbl 1399.11020) Full Text: DOI
Chen, Jinjin; Wang, Liantang Some inequalities related to the Euler-Mascheroni constant. (Chinese. English summary) Zbl 1399.11190 J. Sichuan Norm. Univ., Nat. Sci. 40, No. 6, 731-737 (2017). MSC: 11Y60 40A05 41A25 PDFBibTeX XMLCite \textit{J. Chen} and \textit{L. Wang}, J. Sichuan Norm. Univ., Nat. Sci. 40, No. 6, 731--737 (2017; Zbl 1399.11190) Full Text: DOI
Shi, Baijuan Determinants of RSFPLR circulant matrices of generalized Fibonacci polynomials. (Chinese. English summary) Zbl 1389.15014 J. Sichuan Norm. Univ., Nat. Sci. 40, No. 1, 22-28 (2017). MSC: 15A15 11B39 PDFBibTeX XMLCite \textit{B. Shi}, J. Sichuan Norm. Univ., Nat. Sci. 40, No. 1, 22--28 (2017; Zbl 1389.15014) Full Text: DOI
Liao, Qunying; Luo, Wenli The explicit formula for the Smarandache function and solutions of related equations. (English) Zbl 1389.11067 J. Sichuan Norm. Univ., Nat. Sci. 40, No. 1, 1-10 (2017). MSC: 11B83 11B68 PDFBibTeX XMLCite \textit{Q. Liao} and \textit{W. Luo}, J. Sichuan Norm. Univ., Nat. Sci. 40, No. 1, 1--10 (2017; Zbl 1389.11067) Full Text: DOI
Wei, Jie; Liao, Qunying; Zhou, Jiajun The primitive properties for the type (4,7) Gauss normal basis and its dual basis over finite fields. (Chinese. English summary) Zbl 1374.12003 J. Sichuan Norm. Univ., Nat. Sci. 39, No. 6, 790-793 (2016). MSC: 12E20 11T30 PDFBibTeX XMLCite \textit{J. Wei} et al., J. Sichuan Norm. Univ., Nat. Sci. 39, No. 6, 790--793 (2016; Zbl 1374.12003) Full Text: DOI
Fu, Ruiqin; Yang, Hai; Pei, Yuantai A note on the exponential Diophantine equation \(a^x+b^y=z^2\). (Chinese. English summary) Zbl 1374.11054 J. Sichuan Norm. Univ., Nat. Sci. 39, No. 4, 528-530 (2016). MSC: 11D61 PDFBibTeX XMLCite \textit{R. Fu} et al., J. Sichuan Norm. Univ., Nat. Sci. 39, No. 4, 528--530 (2016; Zbl 1374.11054) Full Text: DOI
Jiang, Lin; Liao, Qunying A note on generalized zero-difference balanced functions. (Chinese. English summary) Zbl 1374.11093 J. Sichuan Norm. Univ., Nat. Sci. 39, No. 4, 484-490 (2016). MSC: 11T22 11T71 94A60 PDFBibTeX XMLCite \textit{L. Jiang} and \textit{Q. Liao}, J. Sichuan Norm. Univ., Nat. Sci. 39, No. 4, 484--490 (2016; Zbl 1374.11093) Full Text: DOI
Li, Kezheng; Ren, Yuan On the quadratic twists of Gross curves. (English) Zbl 1363.11069 J. Sichuan Norm. Univ., Nat. Sci. 39, No. 1, 37-46 (2016). MSC: 11G05 11G15 11G40 PDFBibTeX XMLCite \textit{K. Li} and \textit{Y. Ren}, J. Sichuan Norm. Univ., Nat. Sci. 39, No. 1, 37--46 (2016; Zbl 1363.11069) Full Text: DOI
Luo, Tianqi; Huang, Xin Bell polynomial application in \((2+1)\)-dimensional Nizhnik equations. (Chinese. English summary) Zbl 1349.35339 J. Sichuan Norm. Univ., Nat. Sci. 38, No. 6, 861-866 (2015). MSC: 35Q53 11B73 PDFBibTeX XMLCite \textit{T. Luo} and \textit{X. Huang}, J. Sichuan Norm. Univ., Nat. Sci. 38, No. 6, 861--866 (2015; Zbl 1349.35339) Full Text: DOI
Li, Xuelian; Liao, Qunying The trace and dual bases of some special Gaussian normal bases over finite fields with even characteristic. (Chinese. English summary) Zbl 1349.11146 J. Sichuan Norm. Univ., Nat. Sci. 38, No. 6, 802-809 (2015). MSC: 11T30 12E20 PDFBibTeX XMLCite \textit{X. Li} and \textit{Q. Liao}, J. Sichuan Norm. Univ., Nat. Sci. 38, No. 6, 802--809 (2015; Zbl 1349.11146) Full Text: DOI
Liao, Huan; Liao, Qunying On the existence for specific primitive elements over finite fields. (Chinese. English summary) Zbl 1349.11147 J. Sichuan Norm. Univ., Nat. Sci. 38, No. 6, 797-801 (2015). MSC: 11T30 11T24 PDFBibTeX XMLCite \textit{H. Liao} and \textit{Q. Liao}, J. Sichuan Norm. Univ., Nat. Sci. 38, No. 6, 797--801 (2015; Zbl 1349.11147) Full Text: DOI
Li, Jian; Liao, Qunying; Zhao, Bo; Li, Yiyu On several classes of near-perfect numbers. (Chinese. English summary) Zbl 1340.11007 J. Sichuan Norm. Univ., Nat. Sci. 38, No. 4, 497-499 (2015). MSC: 11A25 PDFBibTeX XMLCite \textit{J. Li} et al., J. Sichuan Norm. Univ., Nat. Sci. 38, No. 4, 497--499 (2015; Zbl 1340.11007) Full Text: DOI
Wang, Rong; Liao, Qunying; Wang, Yunying; Zeng, Maojun; Ning, Yuguang; Hong, Siao An improvement of Hill encryption algorithm. (Chinese. English summary) Zbl 1340.68036 J. Sichuan Norm. Univ., Nat. Sci. 38, No. 1, 8-14 (2015). MSC: 68P25 11T71 94A60 94A62 PDFBibTeX XMLCite \textit{R. Wang} et al., J. Sichuan Norm. Univ., Nat. Sci. 38, No. 1, 8--14 (2015; Zbl 1340.68036) Full Text: DOI
Zheng, Jiabing; Liao, Qunying On mean values of two-term exponential sums. (Chinese. English summary) Zbl 1324.11055 J. Sichuan Norm. Univ., Nat. Sci. 37, No. 6, 788-793 (2014). MSC: 11L03 11L07 PDFBibTeX XMLCite \textit{J. Zheng} and \textit{Q. Liao}, J. Sichuan Norm. Univ., Nat. Sci. 37, No. 6, 788--793 (2014; Zbl 1324.11055) Full Text: DOI
Liao, Qunying; Li, Wei; Tang, Jiangang The multiplication table and complexity of some self-dual normal bases over finite fields. (Chinese. English summary) Zbl 1313.11135 J. Sichuan Norm. Univ., Nat. Sci. 37, No. 1, 31-36 (2014). MSC: 11T30 12E20 PDFBibTeX XMLCite \textit{Q. Liao} et al., J. Sichuan Norm. Univ., Nat. Sci. 37, No. 1, 31--36 (2014; Zbl 1313.11135) Full Text: DOI
Li, Bo; Liao, Qunying The dual basis and multiplication table of the type \(k\)-Gaussian normal basis over finite fields. (Chinese. English summary) Zbl 1313.11134 J. Sichuan Norm. Univ., Nat. Sci. 36, No. 6, 824-829 (2013). MSC: 11T30 12E20 PDFBibTeX XMLCite \textit{B. Li} and \textit{Q. Liao}, J. Sichuan Norm. Univ., Nat. Sci. 36, No. 6, 824--829 (2013; Zbl 1313.11134) Full Text: DOI
Liao, Qunying; Li, Wei; Tang, Jiangang; Xie, Wanlin A class of self-dual normal bases related to the type \(k\) Gaussian period normal basis over finite fields. (Chinese. English summary) Zbl 1299.11085 J. Sichuan Norm. Univ., Nat. Sci. 36, No. 5, 663-668 (2013). MSC: 11T71 11T30 12E20 PDFBibTeX XMLCite \textit{Q. Liao} et al., J. Sichuan Norm. Univ., Nat. Sci. 36, No. 5, 663--668 (2013; Zbl 1299.11085) Full Text: DOI
Zheng, Jiabing; Liao, Qunying On the \(r\)-th power additive complement function of the positive integer \(n\). (Chinese. English summary) Zbl 1274.11148 J. Sichuan Norm. Univ., Nat. Sci. 36, No. 3, 324-327 (2013). MSC: 11N37 11A25 PDFBibTeX XMLCite \textit{J. Zheng} and \textit{Q. Liao}, J. Sichuan Norm. Univ., Nat. Sci. 36, No. 3, 324--327 (2013; Zbl 1274.11148) Full Text: DOI
Wu, Yuesheng; Wang, Guangfu A generalization of Stirling numbers of the second kind. (Chinese. English summary) Zbl 1265.11043 J. Sichuan Norm. Univ., Nat. Sci. 35, No. 3, 309-312 (2012). MSC: 11B73 PDFBibTeX XMLCite \textit{Y. Wu} and \textit{G. Wang}, J. Sichuan Norm. Univ., Nat. Sci. 35, No. 3, 309--312 (2012; Zbl 1265.11043) Full Text: DOI
Su, Dandan Several sufficient conditions for the existence of primitive elements \(\gamma\) and \(\gamma+\gamma^{-1}\) over finite fields. (Chinese. English summary) Zbl 1249.11109 J. Sichuan Norm. Univ., Nat. Sci. 34, No. 4, 532-537 (2011). MSC: 11T71 PDFBibTeX XMLCite \textit{D. Su}, J. Sichuan Norm. Univ., Nat. Sci. 34, No. 4, 532--537 (2011; Zbl 1249.11109) Full Text: DOI
Li, Jun; Huang, Qin; Li, Bo; Liao, Qunying The type \(k\)-Gaussian normal bases over finite fields and their dual bases. (Chinese. English summary) Zbl 1240.11137 J. Sichuan Norm. Univ., Nat. Sci. 34, No. 3, 289-295 (2011). MSC: 11T30 11Y16 12E20 PDFBibTeX XMLCite \textit{J. Li} et al., J. Sichuan Norm. Univ., Nat. Sci. 34, No. 3, 289--295 (2011; Zbl 1240.11137) Full Text: DOI
Zhou, Yafei An improved lower bound for the \(k\)-th prime \(p_k\). (Chinese. English summary) Zbl 1240.11102 J. Sichuan Norm. Univ., Nat. Sci. 33, No. 5, 581-583 (2010). MSC: 11N05 11A41 PDFBibTeX XMLCite \textit{Y. Zhou}, J. Sichuan Norm. Univ., Nat. Sci. 33, No. 5, 581--583 (2010; Zbl 1240.11102) Full Text: DOI
Liao, Qunying; Li, Jun A note on Reed-Solomon codes over finite fields. (English) Zbl 1240.94136 J. Sichuan Norm. Univ., Nat. Sci. 33, No. 4, 540-544 (2010). MSC: 94B27 11T71 PDFBibTeX XMLCite \textit{Q. Liao} and \textit{J. Li}, J. Sichuan Norm. Univ., Nat. Sci. 33, No. 4, 540--544 (2010; Zbl 1240.94136)
Pang, Rongbo Partition identity and counting formulae between partitions and compositions. (Chinese. English summary) Zbl 1240.05017 J. Sichuan Norm. Univ., Nat. Sci. 33, No. 3, 312-316 (2010). MSC: 05A17 11P84 PDFBibTeX XMLCite \textit{R. Pang}, J. Sichuan Norm. Univ., Nat. Sci. 33, No. 3, 312--316 (2010; Zbl 1240.05017) Full Text: DOI
Yang, Xianglong Neither \(G_{40}(\mathbb Q)\) nor \(G_{77}(\mathbb Q)\) is a subgroup of \(K_2\mathbb Q\). (Chinese. English summary) Zbl 1240.19002 J. Sichuan Norm. Univ., Nat. Sci. 33, No. 1, 55-57 (2010). MSC: 19C20 11D25 PDFBibTeX XMLCite \textit{X. Yang}, J. Sichuan Norm. Univ., Nat. Sci. 33, No. 1, 55--57 (2010; Zbl 1240.19002) Full Text: DOI
Duan, Huiming; Yang, Chunde On the Diophantine equation \(x (x+1) (x+2) (x+3)=19y (y+1) (y+2) (y+3)\). (Chinese. English summary) Zbl 1212.11051 J. Sichuan Norm. Univ., Nat. Sci. 32, No. 1, 60-63 (2009). MSC: 11D25 PDFBibTeX XMLCite \textit{H. Duan} and \textit{C. Yang}, J. Sichuan Norm. Univ., Nat. Sci. 32, No. 1, 60--63 (2009; Zbl 1212.11051)
Fu, Ping; Liao, Qunying; Su, Dandan On the upper bound for the sum of inverses of positive integers. (Chinese. English summary) Zbl 1199.11063 J. Sichuan Norm. Univ., Nat. Sci. 31, No. 3, 259-261 (2008). MSC: 11B83 11D68 PDFBibTeX XMLCite \textit{P. Fu} et al., J. Sichuan Norm. Univ., Nat. Sci. 31, No. 3, 259--261 (2008; Zbl 1199.11063)
Pu, Yongfeng; Liao, Qunying On \(t\)-Euler pretty number pairs. (Chinese. English summary) Zbl 1150.11321 J. Sichuan Norm. Univ., Nat. Sci. 30, No. 5, 545-547 (2007). MSC: 11A25 PDFBibTeX XMLCite \textit{Y. Pu} and \textit{Q. Liao}, J. Sichuan Norm. Univ., Nat. Sci. 30, No. 5, 545--547 (2007; Zbl 1150.11321)
He, Cong Divisibility of determinants of quadratic matrices on GCD-closed sets. (Chinese. English summary) Zbl 1207.11036 J. Sichuan Norm. Univ., Nat. Sci. 29, No. 3, 300-302 (2006). MSC: 11C20 11A25 PDFBibTeX XMLCite \textit{C. He}, J. Sichuan Norm. Univ., Nat. Sci. 29, No. 3, 300--302 (2006; Zbl 1207.11036)
Guo, Yuhong; Zhang, Xiandi On the number of positive integral solutions to a kind of Diophantine equations. (Chinese. English summary) Zbl 1096.05501 J. Sichuan Norm. Univ., Nat. Sci. 29, No. 2, 197-199 (2006). MSC: 05A17 11D04 PDFBibTeX XMLCite \textit{Y. Guo} and \textit{X. Zhang}, J. Sichuan Norm. Univ., Nat. Sci. 29, No. 2, 197--199 (2006; Zbl 1096.05501)
Xia, Jianguo; Wang, Shaozu Power bases for the cyclotomic field \(\mathbb Q(\zeta_{15})\). (English) Zbl 1127.11074 J. Sichuan Norm. Univ., Nat. Sci. 28, No. 6, 664-666 (2005). Reviewer: Zhang Xianke (Beijing) MSC: 11R29 11R18 PDFBibTeX XMLCite \textit{J. Xia} and \textit{S. Wang}, J. Sichuan Norm. Univ., Nat. Sci. 28, No. 6, 664--666 (2005; Zbl 1127.11074)
Liu, Jingzhao A problem of Hardy and Littlewood in the set of Piatetski-Shapiro primes. (Chinese. English summary) Zbl 1099.11043 J. Sichuan Norm. Univ., Nat. Sci. 28, No. 2, 188-193 (2005). Reviewer: Jianya Liu (Jinan) MSC: 11L20 11N36 11P32 PDFBibTeX XMLCite \textit{J. Liu}, J. Sichuan Norm. Univ., Nat. Sci. 28, No. 2, 188--193 (2005; Zbl 1099.11043)
Liao, Qunying Some sufficient and necessary conditions for primitive elements over finite fields. (Chinese. English summary) Zbl 1112.11056 J. Sichuan Norm. Univ., Nat. Sci. 28, No. 2, 134-137 (2005). Reviewer: R. Wei (Thunder Bay) MSC: 11T30 11A07 PDFBibTeX XMLCite \textit{Q. Liao}, J. Sichuan Norm. Univ., Nat. Sci. 28, No. 2, 134--137 (2005; Zbl 1112.11056)
Yang, Shichun Some non-uncommon special cases of the Diophantine equation \(x^2-D=2^n\). (Chinese. English summary) Zbl 1085.11022 J. Sichuan Norm. Univ., Nat. Sci. 27, No. 4, 373-377 (2004). Reviewer: Le Maohua (Zhanjiang) MSC: 11D61 PDFBibTeX XMLCite \textit{S. Yang}, J. Sichuan Norm. Univ., Nat. Sci. 27, No. 4, 373--377 (2004; Zbl 1085.11022)
Zhang, Wenzhong The positive integer solution to a class of Diophantine equations. (Chinese. English summary) Zbl 1058.11022 J. Sichuan Norm. Univ., Nat. Sci. 26, No. 6, 574-576 (2003). Reviewer: Le Maohua (Zhanjiang) MSC: 11D09 PDFBibTeX XMLCite \textit{W. Zhang}, J. Sichuan Norm. Univ., Nat. Sci. 26, No. 6, 574--576 (2003; Zbl 1058.11022)
Wei, Xing Some discussions on number fields of \((E,p)\)-type. (Chinese. English summary) Zbl 1007.12004 J. Sichuan Norm. Univ., Nat. Sci. 25, No. 3, 240-242 (2002). MSC: 12F05 11R21 PDFBibTeX XMLCite \textit{X. Wei}, J. Sichuan Norm. Univ., Nat. Sci. 25, No. 3, 240--242 (2002; Zbl 1007.12004)
Lin, Jun A property of polynomial functions over fields and its applications. (Chinese. English summary) Zbl 0962.14016 J. Sichuan Norm. Univ., Nat. Sci. 23, No. 1, 31-32 (2000). MSC: 14G05 11T55 PDFBibTeX XMLCite \textit{J. Lin}, J. Sichuan Norm. Univ., Nat. Sci. 23, No. 1, 31--32 (2000; Zbl 0962.14016)
Zhong, Chunzhen On the decomposition of rational numbers into sums of prime fractions. (Chinese. English summary) Zbl 1014.11025 J. Sichuan Norm. Univ., Nat. Sci. 22, No. 6, 668-670 (1999). Reviewer: Le Maohua (Zhanjiang) MSC: 11D68 PDFBibTeX XMLCite \textit{C. Zhong}, J. Sichuan Norm. Univ., Nat. Sci. 22, No. 6, 668--670 (1999; Zbl 1014.11025)
Liu, Xuefei On the indefinite equation \(\sum_{i=1}^k a_ix_i^{n_i}= y^m\). (Chinese. English summary) Zbl 0948.11014 J. Sichuan Norm. Univ., Nat. Sci. 22, No. 6, 658-659 (1999). Reviewer: Zhenfu Cao (Harbin) MSC: 11D41 PDFBibTeX XMLCite \textit{X. Liu}, J. Sichuan Norm. Univ., Nat. Sci. 22, No. 6, 658--659 (1999; Zbl 0948.11014)