@article{CMUC_1989__30_1_a9,
     author = {Kowalski, Old\v{r}ich},
     title = {A note to a theorem by {K.} {Sekigawa}},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {85--88},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {1989},
     mrnumber = {995705},
     zbl = {0679.53043},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1989__30_1_a9/}
}