On the summability of the formal solutions for some PDEs with irregular singularity

Luo, Zhuangchu; Chen, Hua; Zhang, Changgui

Comptes Rendus. Mathématique, Volume 336 (2003) p. 219-224

Formal solutions of nonlinear first order totally characteristic type PDE with irregular singularity

Chen, Hua; Luo, Zhuangchu; Tahara, Hidetoshi

Annales de l'Institut Fourier, Volume 51 (2001) p. 1599-1620