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R. K.  Brummitt, « Proposing the motion `that this house believes that Linnaean classification without parapyletic taxa is nonsensical': the theoretical case », The Linnaean, vol. 13, 1997.

R. K.  Brummitt et Sosef, M. S. M., « Paraphyletic taxa are inherent in Linnaean classification - a reply to Freudenstein », Taxon, vol. 47, p. 411-412, 1998.