@article{SM_2012_203_2_a2,
     author = {V. O. Manturov},
     title = {Parity and cobordism of free knots},
     journal = {Sbornik. Mathematics},
     pages = {196--223},
     publisher = {mathdoc},
     volume = {203},
     number = {2},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2012_203_2_a2/}
}