TY  - JOUR
AU  - Derzko, N. A.
TI  - Gentle Perturbations of with Application to
JO  - Canadian journal of mathematics
PY  - 1970
SP  - 1055
EP  - 1070
VL  - 22
IS  - 5
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1970-122-7/
DO  - 10.4153/CJM-1970-122-7
ID  - 10_4153_CJM_1970_122_7
ER  -