TY  - JOUR
AU  - M. Kwapisz
TI  - On the approximate solutions of an abstract equation
JO  - Annales Polonici Mathematici
PY  - 1967
SP  - 47
EP  - 60
VL  - 19
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/ap-19-1-47-60/
DO  - 10.4064/ap-19-1-47-60
LA  - en
ID  - 10_4064_ap_19_1_47_60
ER  -