TY  - JOUR
AU  - B. N. Rachajsky
TI  - On a variant in the theory of characteristics for systems of first order partial differential  equations
JO  - Matematički vesnik
PY  - 1967
SP  - 329 
VL  - 19
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MV_1967_19_3_a20/
ID  - MV_1967_19_3_a20
ER  -