TY  - JOUR
AU  - Neuman, František
TI  - Smoothness as an invariant property of coefficients of linear differential equations
JO  - Czechoslovak Mathematical Journal
PY  - 1989
SP  - 513
EP  - 521
VL  - 39
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1989.102323/
DO  - 10.21136/CMJ.1989.102323
LA  - en
ID  - 10_21136_CMJ_1989_102323
ER  -