@article{AA_2000_12_4_a3,
     author = {M. N. Gusarov},
     title = {Variations of knotted graphs. {The} geometric technique of $n$-equivalence},
     journal = {Algebra i analiz},
     pages = {79--125},
     publisher = {mathdoc},
     volume = {12},
     number = {4},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2000_12_4_a3/}
}