@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/}
}