@article{10_4153_CMB_2006_056_8,
     author = {Stoimenow, A.},
     title = {On the {Polyak{\textendash}Viro} {Vassiliev} {Invariant} of {Degree} 4},
     journal = {Canadian mathematical bulletin},
     pages = {609--623},
     year = {2006},
     volume = {49},
     number = {4},
     doi = {10.4153/CMB-2006-056-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2006-056-8/}
}