Finite Type Invariants of Classical and Virtual Knots

@article{Goussarov1998FiniteTI,
  title={Finite Type Invariants of Classical and Virtual Knots},
  author={Mikhail Goussarov and Michael Polyak and Oleg Ya. Viro},
  journal={Topology},
  year={1998},
  volume={39},
  pages={1045-1068}
}
A polynomial invariant of long virtual knots
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