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Diao, Yuanan (2004), "The additivity of crossing numbers", Journal of Knot Theory and its Ramifications, 13 (7): 857–866, doi:10.1142/S0218216504003524, MR2101230
Adams, Colin C. (2004), The Knot Book: An Elementary Introduction to the Mathematical Theory of Knots, Providence, RI: American Mathematical Society, p. 69, ISBN9780821836781, MR2079925
doi.org
Diao, Yuanan (2004), "The additivity of crossing numbers", Journal of Knot Theory and its Ramifications, 13 (7): 857–866, doi:10.1142/S0218216504003524, MR2101230
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