no. 3-4
On pseudosymmetric systems with one space variable
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 30 (2001) no. 3-4, pp. 661-679.
corrected-by Errata to : “On pseudosymmetric systems with one space variable” 
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     title = {On pseudosymmetric systems with one space variable},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {661--679},
     publisher = {Scuola normale superiore},
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Nishitani, Tatsuo; Spagnolo, Sergio. On pseudosymmetric systems with one space variable. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 30 (2001) no. 3-4, pp. 661-679. http://archive.numdam.org/item/ASNSP_2001_4_30_3-4_661_0/

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