List of citations in Numdam for : On the singularities of the solution of the Cauchy problem for the operator with non uniform multiple characteristics

Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 4 (1977) no. 4, pp. 725-755.

Journées équations aux dérivées partielles (1983), article no. 13, 9 p.