@article{GDZPPN00220620X,
title = {Representing of K13 as a 2-pire map on the Klein bottle.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {394},
year = {1989},
pages = {132-133},
zbl = {0653.05027},
url = {http://dml.mathdoc.fr/item/GDZPPN00220620X}
}
Borodin, O.V. Representing of K13 as a 2-pire map on the Klein bottle.. Journal für die reine und angewandte Mathematik, Tome 394 (1989) pp. 132-133. http://gdmltest.u-ga.fr/item/GDZPPN00220620X/