Article:Math.GT/0407493/arxiv-references
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- Eiji Ogasa, Ribbon-moves of 2-knots: the Farber-Levine pairing and the Atiyah-Patodi-Singer-Casson-Gordon-Ruberman $\widetilde\eta$-invariants of 2-knots, local page, arxiv:math.GT/0004007.
- Magnus Jacobsson, An invariant of link cobordisms from Khovanov homology, local page, arxiv:math.GT/0206303.
- Mikhail Khovanov, An invariant of tangle cobordisms, local page, arxiv:math.GT/0207264.
