@article{1029000317, author = {Petrovanu, Dan}, title = {Periodic solutions of the Tricomi problem.}, journal = {Michigan Math. J.}, volume = {16}, number = {1}, year = {1969}, pages = { 331-348}, language = {en}, url = {http://dml.mathdoc.fr/item/1029000317} }
Petrovanu, Dan. Periodic solutions of the Tricomi problem.. Michigan Math. J., Tome 16 (1969) no. 1, pp. 331-348. http://gdmltest.u-ga.fr/item/1029000317/