@article{CMUC_1968_9_2_a11,
     author = {Najzar, Karel},
     title = {On the method of least squares of finding eigenvalues of some symmetric operators},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {311--323},
     year = {1968},
     volume = {9},
     number = {2},
     mrnumber = {0236740},
     zbl = {0172.17501},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1968_9_2_a11/}
}