1. Winnie AP, Ramamurthy S, Durrani Z, Radonjic R. Plexus blocks for lower extremity surgery: new answers to old problems. Anesthesiol Rev. 1974;1:11–6.
2. Chayen D, Nathan H, Chayen M. The psoas compartment block. Anesthesiology. 1976;45(1):95–9.
3. Lee EM, Murphy KP, Ben-David B. Postoperative analgesia for hip arthroscopy: combined L1 and L2 paravertebral blocks. J Clin Anesth. 2008;20:462–5.
4. Möller T, Benthaus S, Huber M, Bentrup I, Schofer M, Eberhart L, Wulf H, Morin A. A randomized and observer blinded comparison of continuous femoral block and fascia iliaca compartment block in hip replacement surgery. J Anesth Clin Res. 2011;4:1.
5. Ben-Ari AY, Joshi R, Uskova A, Chelly JE. Ultrasound localization of the sacral plexus using a parasacral approach. Anesth Analg. 2009;108(6):1977–80.