P. C.  van Welzen, ?Phylogenetic versus Linnean taxonomy, the continuuing story?, Taxon, vol. 47, pp. 413-423, 1998.

C.  Schander, ?Mandatory categories and impossible hierarchies - a rely to Sosef?, Taxon, vol. 47, pp. 407-410, 1998.

C.  Schander, ?Types, emendations and names - a reply to Liden & al?, Taxon, vol. 47, pp. 401-406, 1998.

E. B.  Knox, ?The use of hierarchies as organizational models in systematics?, Biological Journal of the Linnean Society of London, vol. 63, pp. 1-49, 1998.

J. V.  Freudenstein, ?Paraphyly, ancestors, and classification - a reply ro Sosef and Brummitt?, Taxon, vol. 47, pp. 95-104, 1998.

R. K.  Brummitt and Sosef, M. S. M., ?Paraphyletic taxa are inherent in Linnaean classification - a reply to Freudenstein?, Taxon, vol. 47, pp. 411-412, 1998.

A.  Backlund and Bremer, K., ?To be or not to be - principles of classification and monotypic plant families?, Taxon, vol. 47, pp. 391-400, 1998.