@article{GDZPPN002067498,
title = {On the nodal lines of second eigenfunctions of the fixed membrane problem.},
journal = {Commentarii mathematici Helvetici},
volume = {65},
year = {1990},
pages = {96-103},
zbl = {0705.35003},
url = {http://dml.mathdoc.fr/item/GDZPPN002067498}
}
Pütter, Rolf. On the nodal lines of second eigenfunctions of the fixed membrane problem.. Commentarii mathematici Helvetici, Tome 65 (1990) pp. 96-103. http://gdmltest.u-ga.fr/item/GDZPPN002067498/