On a class of unsolvable operators
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 20 (1993) no. 3, pp. 357-369. 
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     title = {On a class of unsolvable operators},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {357--369},
     publisher = {Scuola normale superiore},
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     zbl = {0816.47051},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1993_4_20_3_357_0/}
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Cicognani, Massimo; Zanghirati, Luisa. On a class of unsolvable operators. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 20 (1993) no. 3, pp. 357-369. http://www.numdam.org/item/ASNSP_1993_4_20_3_357_0/

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