@article{1183527308, author = {Ludwig, Donald}, title = {Wave propagation near a smooth caustic}, journal = {Bull. Amer. Math. Soc.}, volume = {71}, number = {6}, year = {1965}, pages = { 776-779}, language = {en}, url = {http://dml.mathdoc.fr/item/1183527308} }
Ludwig, Donald. Wave propagation near a smooth caustic. Bull. Amer. Math. Soc., Tome 71 (1965) no. 6, pp. 776-779. http://gdmltest.u-ga.fr/item/1183527308/