TY  - JOUR
AU  - Swanson, C. A.
TI  - On a Non-Analytic Perturbation Problem
JO  - Canadian mathematical bulletin
PY  - 1961
SP  - 243
EP  - 248
VL  - 4
IS  - 3
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1961-027-6/
DO  - 10.4153/CMB-1961-027-6
ID  - 10_4153_CMB_1961_027_6
ER  -