%0 Journal Article %T The Pn -Integral %J Canadian mathematical bulletin %D 1975 %P 493-497 %V 18 %N 4 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1975-090-6/ %R 10.4153/CMB-1975-090-6 %F 10_4153_CMB_1975_090_6