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@article{PORMA_1985__43_3_114516, author = {Fattorini, H.O.}, title = {Two approximation results for the parabolic singular perturbation problem}, journal = {Portugaliae mathematica}, pages = {331--346}, publisher = {mathdoc}, volume = {43}, number = {3}, year = {1985}, mrnumber = {0886460}, zbl = {0603.34056}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1985__43_3_114516/} }
Fattorini, H.O. Two approximation results for the parabolic singular perturbation problem. Portugaliae mathematica, Tome 43 (1985) no. 3, pp. 331-346. http://geodesic.mathdoc.fr/item/PORMA_1985__43_3_114516/