Chapter 4: Criteria of Availability
[:Article10:Article 10. Provisions conferring availability]
[:Article11: Article 11. Requirements]
[:Article12:Article 12. Names published before 1931]
[:Article13:Article 13. Names published after 1930]
[:Article14:Article 14. Anonymous authorship of names and nomenclatural acts]
[:Article15:Article 15. Names and nomenclatural acts published after 1960]
[:Article16: Article 16. Names published after 1999]
[:Article17: Article 17. Names found to denote more than one taxon, or taxa of hybrid origin, or based on parts or stages of animals or on unusual specimens]
[:Article18:Article 18. Inappropriate and tautonymous names]
[:Article19:Article 19. Status of emendations, incorrect spellings, and mandatory changes]
[:Article20:Article 20. Genus-group names ending in -ites, -ytes, or -ithes given to fossils]