@article{GDZPPN002057301,
title = {HOELDER continuity and initial value problems of mixed type differential equations.},
journal = {Commentarii mathematici Helvetici},
volume = {33},
year = {1959},
pages = {296-321},
zbl = {0111.29206},
url = {http://dml.mathdoc.fr/item/GDZPPN002057301}
}
Chen, Y.W. HOELDER continuity and initial value problems of mixed type differential equations.. Commentarii mathematici Helvetici, Tome 33 (1959) pp. 296-321. http://gdmltest.u-ga.fr/item/GDZPPN002057301/