@article{PIM_1976_N_S_20_34_a8,
     author = {Stefan Czerwik},
     title = {On {Some} {Functional-Differential} {Equations}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {67 },
     year = {1976},
     volume = {_N_S_20},
     number = {34},
     url = {http://geodesic.mathdoc.fr/item/PIM_1976_N_S_20_34_a8/}
}