@article{MS2_1976__38_166453,
     author = {Jorn B. Olson},
     title = {McKay numbers and heights of characters.},
     journal = {Mathematica Scandinavica},
     pages = {25--42},
     publisher = {mathdoc},
     volume = {38},
     year = {1976},
     zbl = {0327.20005},
     url = {http://geodesic.mathdoc.fr/item/MS2_1976__38_166453/}
}