@article{AM2_1975__12_136521,
     author = {Stanko Bilinski},
     title = {Linearly additive functions of two indices. {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {319--320},
     publisher = {mathdoc},
     volume = {12},
     year = {1975},
     url = {http://geodesic.mathdoc.fr/item/AM2_1975__12_136521/}
}