@article{AM2_1994__47_2-3_137582,
     author = {L\'aszl\'o Losonczi},
     title = {Measurable solutions of a (2, 2)-type sum form functional equation.},
     journal = {Aequationes mathematicae},
     pages = {203--222},
     publisher = {mathdoc},
     volume = {47},
     number = {2-3},
     year = {1994},
     zbl = {0803.39009},
     url = {http://geodesic.mathdoc.fr/item/AM2_1994__47_2-3_137582/}
}