TY  - JOUR
AU  - Chrastina, Jan
TI  - On formal theory of differential equations. III.
JO  - Mathematica Bohemica
PY  - 1991
SP  - 60
EP  - 90
VL  - 116
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/MB.1991.126196/
DO  - 10.21136/MB.1991.126196
LA  - en
ID  - 10_21136_MB_1991_126196
ER  -