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@article{MASLO_1981__31_3_a6, author = {H\'a\v{c}ik, Milo\v{s}}, title = {Some analogues for higher monotonicity of the {Sonin-Butlewski-P\'olya} theorem}, journal = {Mathematica slovaca}, pages = {291--296}, publisher = {mathdoc}, volume = {31}, number = {3}, year = {1981}, mrnumber = {621919}, zbl = {0466.34016}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1981__31_3_a6/} }
Háčik, Miloš. Some analogues for higher monotonicity of the Sonin-Butlewski-Pólya theorem. Mathematica slovaca, Tome 31 (1981) no. 3, pp. 291-296. http://geodesic.mathdoc.fr/item/MASLO_1981__31_3_a6/