@article{01154626, title = {Asymptotic solutions for mixed-type equations with a small deviation.}, journal = {Georgian Mathematical Journal}, volume = {5}, year = {1998}, pages = {107-120}, doi = {10.1007/BF02767991}, zbl = {0903.34066}, language = {en}, url = {http://dml.mathdoc.fr/item/01154626} }
Hou, Zhanyuan; Cassell, J.S. Asymptotic solutions for mixed-type equations with a small deviation.. Georgian Mathematical Journal, Tome 5 (1998) pp. 107-120. doi : 10.1007/BF02767991. http://gdmltest.u-ga.fr/item/01154626/