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@article{MS2_1957__5_165645, author = {JAAK PEETRE}, title = {A generalization of {Courant's} nodal domain theorem..}, journal = {Mathematica Scandinavica}, pages = {15--20}, publisher = {mathdoc}, volume = {5}, year = {1957}, zbl = {0077.30101}, url = {http://geodesic.mathdoc.fr/item/MS2_1957__5_165645/} }
JAAK PEETRE. A generalization of Courant's nodal domain theorem... Mathematica Scandinavica, Tome 5 (1957), pp. 15-20. http://geodesic.mathdoc.fr/item/MS2_1957__5_165645/