1. Hair extracted from an ulcer;Anderson;Boston M. & S. J.,1847
2. Diagnosis and treatment of pilonidal sinus;Anderson;Minnesota Med.,1931
3. Developmental Anatomy;Arey,1940
4. Developmental Anatomy;Arey,1940
5. Pilonidal cysts—sclerosing method of treatment;Aschoff;Arch. Surg.,1938