Huang, Xueying; Cai, Mingjian; Luo, Zhuangchu Formal solutions of totally characteristic type PDE with irregular singularity. I. (Chinese. English summary) Zbl 1164.35306 J. Math., Wuhan Univ. 28, No. 1, 109-112 (2008). MSC: 35A20 35F20 35C10 PDFBibTeX XMLCite \textit{X. Huang} et al., J. Math., Wuhan Univ. 28, No. 1, 109--112 (2008; Zbl 1164.35306)
Luo, Zhuangchu; Chen, Hua; Zhang, Changgui On the summability of the formal solutions for some PDEs with irregular singularity. (English. Abridged French version) Zbl 1028.35006 C. R., Math., Acad. Sci. Paris 336, No. 3, 219-224 (2003). MSC: 35A20 35C10 35G20 PDFBibTeX XMLCite \textit{Z. Luo} et al., C. R., Math., Acad. Sci. Paris 336, No. 3, 219--224 (2003; Zbl 1028.35006) Full Text: DOI