TY  - JOUR
AU  - Rubio, G.
AU  - Jódar, L.
TI  - Approximate solutions and error bounds for second order operator differential equations
JO  - Portugaliae mathematica
PY  - 1991
SP  - 165
EP  - 177
VL  - 48
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_1991__48_2_115748/
LA  - en
ID  - PORMA_1991__48_2_115748
ER  -