@article{01668933,
title = {Some remarks on the solutions of the equality per},
journal = {S\'eminaire Lotharingien de Combinatoire [electronic only]},
volume = {18},
year = {1987},
zbl = {1001.15008},
language = {en},
url = {http://dml.mathdoc.fr/item/01668933}
}
Kräuter, Arnold Richard. Some remarks on the solutions of the equality per. Séminaire Lotharingien de Combinatoire [electronic only], Tome 18 (1987) . http://gdmltest.u-ga.fr/item/01668933/