1. Appendix vermiform duplex;Cavé;J. Anat.,1936
2. Agenesis of the vermiform appendix;Collins;Am. J. Surg.,1951
3. Congenital absence of the vermiform appendix;Elias;Arch. Surg.,1967
4. Congenital malformations in a thalidomide baby;Hagen;Can. Med. Assoc. J.,1965
5. Congenital absence of the vermiform appendix;Host;Am. Surg.,1972