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@article{AUCMP_1994__35_2_a6, author = {Kulpa, W.}, title = {Sandwich type theorems}, journal = {Acta Universitatis Carolinae. Mathematica et Physica}, pages = {45--50}, publisher = {mathdoc}, volume = {35}, number = {2}, year = {1994}, mrnumber = {1366497}, zbl = {0826.54033}, language = {en}, url = {http://geodesic.mathdoc.fr/item/AUCMP_1994__35_2_a6/} }
Kulpa, W. Sandwich type theorems. Acta Universitatis Carolinae. Mathematica et Physica, Tome 35 (1994) no. 2, pp. 45-50. http://geodesic.mathdoc.fr/item/AUCMP_1994__35_2_a6/