@article{SM_2010_201_6_a0,
     author = {D. M. Afanas'ev},
     title = {Refining virtual knot invariants by means of parity},
     journal = {Sbornik. Mathematics},
     pages = {785--800},
     publisher = {mathdoc},
     volume = {201},
     number = {6},
     year = {2010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2010_201_6_a0/}
}