@article{PIM_1974_N_S_17_31_a18,
     author = {Milan R. Taskovi\'c},
     title = {Monotonic mappings on ordered sets, a class of inequalities with finite differences and fixed points},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {163 },
     publisher = {mathdoc},
     volume = {_N_S_17},
     number = {31},
     year = {1974},
     url = {http://geodesic.mathdoc.fr/item/PIM_1974_N_S_17_31_a18/}
}