1. Andrews BT, Burnand KG, Ferrar D (1996) Putting a finger on the deep inguinal ring. J R Coll Surg Edinb 41:90–92
2. Bay-Nielsen M, Kehlet H, Strand L et al (2001) Quality assessment of 26 304 herniorrhaphies in Denmark: a prospective nationwide study. Lancet 358:1124–1128
3. Browse NL (1997) An introduction to the symptoms and signs of surgical disease, 3rd edn. Edward Arnold, London, p 324
4. Campbell IR (1988) What is the surface marking of the deep inguinal ring? J R Coll Surg Edinb 33:247–248
5. Clain A (1994) Hamilton Bailey’s demonstrations of physical signs in clinical surgery, 17th edn. Butterworth-Heinemann, Oxford, p 2616