@article{10_4064_fm_97_3_187_198,
     author = {Maria Mastalerz-Wawrzy\'nczak},
     title = {On a certain condition of the monotonicity of functions},
     journal = {Fundamenta Mathematicae},
     pages = {187--198},
     publisher = {mathdoc},
     volume = {97},
     number = {3},
     year = {1977},
     doi = {10.4064/fm-97-3-187-198},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-97-3-187-198/}
}