@article{10_4064_cm_31_2_289_292,
     author = {H. W. Pu},
     title = {A monotonicity criterion for arbitrary functions},
     journal = {Colloquium Mathematicum},
     pages = {289--292},
     publisher = {mathdoc},
     volume = {31},
     number = {2},
     year = {1974},
     doi = {10.4064/cm-31-2-289-292},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-31-2-289-292/}
}