@article{10_4153_CJM_1966_086_2,
     author = {Ton, Bui An},
     title = {Singular {Perturbations} of {Non-Linear} {Elliptic} and {Parabolic} {Variational} {Boundary-Value} {Problems}},
     journal = {Canadian journal of mathematics},
     pages = {861--872},
     year = {1966},
     volume = {18},
     number = {1},
     doi = {10.4153/CJM-1966-086-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1966-086-2/}
}