@article{10_21136_CMJ_1959_100341,
     author = {Makai, E.},
     title = {On the principal frequency of a convex membrane and related problems},
     journal = {Czechoslovak Mathematical Journal},
     pages = {66--70},
     year = {1959},
     volume = {9},
     number = {1},
     doi = {10.21136/CMJ.1959.100341},
     zbl = {0084.20704},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1959.100341/}
}