@article{CMH_1994__69_4_140330,
     author = {Giovanni Alessandrini},
     title = {Nodal lines of eigenfunctions of the fixed membrane problem in general convex domains.},
     journal = {Commentarii mathematici Helvetici},
     pages = {142--154},
     publisher = {mathdoc},
     volume = {69},
     number = {4},
     year = {1994},
     zbl = {0838.35006},
     url = {http://geodesic.mathdoc.fr/item/CMH_1994__69_4_140330/}
}