@article{1102968002, author = {Ballou, Donald P.}, title = {Shock sets for first order nonlinear hyperbolic equations.}, journal = {Pacific J. Math.}, volume = {43}, number = {3}, year = {1972}, pages = { 17-26}, language = {en}, url = {http://dml.mathdoc.fr/item/1102968002} }
Ballou, Donald P. Shock sets for first order nonlinear hyperbolic equations.. Pacific J. Math., Tome 43 (1972) no. 3, pp. 17-26. http://gdmltest.u-ga.fr/item/1102968002/