Smoll NR (ianuarie 2010). „Variations of the piriformis and sciatic nerve with clinical consequence: a review”. Clinical Anatomy. 23 (1): 8–17. doi:10.1002/ca.20893. PMID19998490.
Lang AM (martie 2004). „Botulinum toxin type B in piriformis syndrome”. American Journal of Physical Medicine & Rehabilitation. 83 (3): 198–202. doi:10.1097/01.PHM.0000113404.35647.D8. PMID15043354.
Smoll NR (ianuarie 2010). „Variations of the piriformis and sciatic nerve with clinical consequence: a review”. Clinical Anatomy. 23 (1): 8–17. doi:10.1002/ca.20893. PMID19998490.
Lang AM (martie 2004). „Botulinum toxin type B in piriformis syndrome”. American Journal of Physical Medicine & Rehabilitation. 83 (3): 198–202. doi:10.1097/01.PHM.0000113404.35647.D8. PMID15043354.