%0 Journal Article %A JAAK PEETRE %T A generalization of Courant's nodal domain theorem.. %J Mathematica Scandinavica %D 1957 %P 15-20 %V 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/MS2_1957__5_165645/ %F MS2_1957__5_165645