Ajossa S, Paoletti AM, Garau N, Mais V, Piras B, Gerada M, Silvetti E, Orrù M, Floris L, Melis GB.
Ultrasound in the Diagnosis of Deep Endometriosis. 
Donald School J Ultrasound Obstet Gynecol 
2009;
3
(1):15-20.