Tikhonov, A. N.; Ivanov, V. K.; Lavrent’ev, M. M. Improperly posed problems. (English) Zbl 0353.35081 Am. Math. Soc., Translat., II. Ser. 105, 313-332 (1976). MSC: 35R25 31B20 35R30 47B99 65N99 PDFBibTeX XMLCite \textit{A. N. Tikhonov} et al., Transl., Ser. 2, Am. Math. Soc. 105, 313--332 (1976; Zbl 0353.35081) Full Text: DOI
Tikhonov, A. N.; Ivanov, V. K.; Lavrent’ev, M. M. Improperly posed problems. (Russian) Zbl 0346.35089 Differ. Uravn. Chastn. Proizvodnymi, Tr. Simp. Posvyasc. 60-let. Akad. S. L. Sobolev, 224-238 (1970). Reviewer: G. Anger MSC: 35R25 35-02 31B20 35R30 47B99 65N21 PDFBibTeX XML
Tikhonov, A. N.; Arsenin, V. Ya. Über einige nichtlineare Funktionale. (Russian) Zbl 0209.15705 Mat. Sb., N. Ser. 65(107), 512-521 (1964). MSC: 47H99 31C15 PDFBibTeX XMLCite \textit{A. N. Tikhonov} and \textit{V. Ya. Arsenin}, Mat. Sb., Nov. Ser. 65(107), 512--521 (1964; Zbl 0209.15705)