@article{CMUC_1971__12_3_a1,
     author = {Kr\'al, Josef and Luke\v{s}, Jaroslav and Netuka, Ivan},
     title = {Elliptic points in one-dimensional harmonic spaces},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {453--483},
     publisher = {mathdoc},
     volume = {12},
     number = {3},
     year = {1971},
     mrnumber = {0291493},
     zbl = {0222.31018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1971__12_3_a1/}
}