@article{AM2_1987__33_137199,
     author = {J.-P. Reus Christensen and Pal Fischer},
     title = {Small sets and a class of general functions.},
     journal = {Aequationes mathematicae},
     pages = {18--22},
     publisher = {mathdoc},
     volume = {33},
     year = {1987},
     zbl = {0628.28011},
     url = {http://geodesic.mathdoc.fr/item/AM2_1987__33_137199/}
}