@article{ASNSP_1992_4_19_4_493_0, author = {d'Ancona, Piero}, title = {Periodic solutions for a second order partial differential equation}, journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze}, pages = {493--506}, publisher = {Scuola normale superiore}, volume = {Ser. 4, 19}, number = {4}, year = {1992}, zbl = {0778.35006}, mrnumber = {1205881}, language = {en}, url = {archive.numdam.org/item/ASNSP_1992_4_19_4_493_0/} }
d'Ancona, Piero. Periodic solutions for a second order partial differential equation. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 19 (1992) no. 4, pp. 493-506. http://archive.numdam.org/item/ASNSP_1992_4_19_4_493_0/
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