Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{ELMA_1973__28_141089, author = {A. Rotkiewict}, title = {On {Pyramidal} {Numbers} of {Order} 4.}, journal = {Elemente der Mathematik}, pages = {14--16}, publisher = {mathdoc}, volume = {28}, year = {1973}, url = {http://geodesic.mathdoc.fr/item/ELMA_1973__28_141089/} }
A. Rotkiewict. On Pyramidal Numbers of Order 4.. Elemente der Mathematik, Tome 28 (1973), pp. 14-16. http://geodesic.mathdoc.fr/item/ELMA_1973__28_141089/