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@article{CMH_1959__33_139177, author = {Y.W. Chen}, title = {HOELDER continuity and initial value problems of mixed type differential equations.}, journal = {Commentarii mathematici Helvetici}, pages = {296--321}, publisher = {mathdoc}, volume = {33}, year = {1959}, zbl = {0111.29206}, url = {http://geodesic.mathdoc.fr/item/CMH_1959__33_139177/} }
Y.W. Chen. HOELDER continuity and initial value problems of mixed type differential equations.. Commentarii mathematici Helvetici, Tome 33 (1959), pp. 296-321. http://geodesic.mathdoc.fr/item/CMH_1959__33_139177/