@article{10_21136_CPM_1967_117588,
     author = {Marek, Ivo},
     title = {On approximate methods in eigenvalue problems},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {89--104},
     publisher = {mathdoc},
     volume = {092},
     number = {1},
     year = {1967},
     doi = {10.21136/CPM.1967.117588},
     mrnumber = {0211598},
     zbl = {0167.13903},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1967.117588/}
}