@article{03600807,
title = {Crosscaps and knots.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {1},
year = {1978},
pages = {113-124},
doi = {10.1155/S0161171278000149},
zbl = {0386.57003},
language = {en},
url = {http://dml.mathdoc.fr/item/03600807}
}
Clark, Bradd Evans. Crosscaps and knots.. International Journal of Mathematics and Mathematical Sciences, Tome 1 (1978) pp. 113-124. doi : 10.1155/S0161171278000149. http://gdmltest.u-ga.fr/item/03600807/