@article{JRAM_1989__393_153094,
     author = {O.V. Borodin},
     title = {Representing of {K13} as a 2-pire map on the {Klein} bottle.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {132--133},
     publisher = {mathdoc},
     volume = {393},
     year = {1989},
     zbl = {0653.05027},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1989__393_153094/}
}