@article{ASNSP_1991_4_18_1_39_0, author = {Cicognani, Massimo}, title = {The geometric optics for a class of hyperbolic second order operators with H\"older continuous coefficients with respect to time}, journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze}, publisher = {Scuola normale superiore}, volume = {Ser. 4, 18}, number = {1}, year = {1991}, pages = {39-66}, zbl = {0761.35055}, mrnumber = {1118220}, language = {en}, url = {http://www.numdam.org/item/ASNSP_1991_4_18_1_39_0} }
Cicognani, Massimo. The geometric optics for a class of hyperbolic second order operators with Hölder continuous coefficients with respect to time. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 18 (1991) no. 1, pp. 39-66. http://www.numdam.org/item/ASNSP_1991_4_18_1_39_0/
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