@article{ASNSP_1976_4_3_2_187_0, author = {Gilioli, Antonio}, title = {A class of second-order evolution equations with double characteristics}, journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze}, publisher = {Scuola normale superiore}, volume = {Ser. 4, 3}, number = {2}, year = {1976}, pages = {187-229}, zbl = {0327.35018}, mrnumber = {437961}, language = {en}, url = {http://www.numdam.org/item/ASNSP_1976_4_3_2_187_0} }
Gilioli, Antonio. A class of second-order evolution equations with double characteristics. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 3 (1976) no. 2, pp. 187-229. http://www.numdam.org/item/ASNSP_1976_4_3_2_187_0/
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