%0 Journal Article %A Ton, Bui An %T Singular Perturbations of Non-Linear Elliptic and Parabolic Variational Boundary-Value Problems %J Canadian journal of mathematics %D 1966 %P 861-872 %V 18 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1966-086-2/ %R 10.4153/CJM-1966-086-2 %F 10_4153_CJM_1966_086_2