@article{CMUC_1966_7_1_a5,
     author = {Marek, Ivo},
     title = {On the minimax principle for $K$-positive operators {(Preliminary} communication)},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {109--112},
     year = {1966},
     volume = {7},
     number = {1},
     mrnumber = {0200728},
     zbl = {0171.34905},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1966_7_1_a5/}
}