TY - JOUR AU - Ton, Bui An TI - Singular Perturbations of Non-Linear Elliptic and Parabolic Variational Boundary-Value Problems JO - Canadian journal of mathematics PY - 1966 SP - 861 EP - 872 VL - 18 IS - 1 UR - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1966-086-2/ DO - 10.4153/CJM-1966-086-2 ID - 10_4153_CJM_1966_086_2 ER -