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Mahdi M, Joseph NJ, Hernandez DP, Crystal GJ, Baraka A, Salem MR.Mahdi M, et al. Among authors: crystal gj.Middle East J Anaesthesiol. 2011 Jun;21(2):259-67.Middle East J Anaesthesiol. 2011.PMID: 22435278
Abdel-Latif M, Kim SJ, Salem MR, Crystal GJ.Abdel-Latif M, et al. Among authors: crystal gj.Anesth Analg. 1992 Jun;74(6):870-6. doi: 10.1213/00000539-199206000-00016.Anesth Analg. 1992.PMID: 1595919