@article{AM2_1974__11_136436,
     author = {K. Lajk\'o},
     title = {Applications of {Extensions} of {Additive} {Functions.}},
     journal = {Aequationes mathematicae},
     pages = {68--76},
     publisher = {mathdoc},
     volume = {11},
     year = {1974},
     zbl = {0289.39005},
     url = {http://geodesic.mathdoc.fr/item/AM2_1974__11_136436/}
}