@article{CMUC_1989__30_1_a8,
     author = {Kombarov, Anatoli P.},
     title = {On rectangular covers of $X^2\setminus \Delta$},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {81--83},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {1989},
     mrnumber = {995704},
     zbl = {0667.54014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1989__30_1_a8/}
}