1. Nonvenereal treponematoses;Koff;J Am Acad Dermatol,1993
2. Spirochetes;Musher,1992
3. Nonvenereal treponematoses in tropical countries;Engelkens;Clin Dermatol,1999
4. Spirochetes and other spiral organisms. Medical microbiology;Brooks,1991
5. Syphilis;Rudolph,1996