TY  - JOUR
AU  - Ibrahim, Sobhy El-sayed
TI  - On $L^2_w$-quasi-derivatives for solutions of perturbed general quasi-differential equations
JO  - Czechoslovak Mathematical Journal
PY  - 1999
SP  - 877
EP  - 890
VL  - 49
IS  - 4
UR  - http://geodesic.mathdoc.fr/item/CMJ_1999_49_4_a18/
LA  - en
ID  - CMJ_1999_49_4_a18
ER  -