TY  - JOUR
AU  - J.S. Cassel
AU  - Zhanyuan Hou
TI  - Initial Value Problem for Mixed-Type Differential Equations.
JO  - Monatshefte für Mathematik
PY  - 1997
SP  - 133
EP  - 146
VL  - 124
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MOMA_1997__124_4_178785/
ID  - MOMA_1997__124_4_178785
ER  -