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@article{MASLO_1992__42_2_a9, author = {Tong, Jingcheng}, title = {Internal, external boundaries and continuous mappings}, journal = {Mathematica slovaca}, pages = {215--221}, publisher = {mathdoc}, volume = {42}, number = {2}, year = {1992}, mrnumber = {1170106}, zbl = {0783.54011}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1992__42_2_a9/} }
Tong, Jingcheng. Internal, external boundaries and continuous mappings. Mathematica slovaca, Tome 42 (1992) no. 2, pp. 215-221. http://geodesic.mathdoc.fr/item/MASLO_1992__42_2_a9/