@article{PIM_1985_N_S_37_51_a3,
     author = {Miodrag Ra\v{s}kovi\'c},
     title = {An {Application} of {Nonstandard} {Analysis} to {Functional} {Equations}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {23 },
     publisher = {mathdoc},
     volume = {_N_S_37},
     number = {51},
     year = {1985},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1985_N_S_37_51_a3/}
}