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Gray RR, St Louis EL, Grosman H.Gray RR, et al.Br J Radiol. 1987 Nov;60(719):1067-70. doi: 10.1259/0007-1285-60-719-1067.Br J Radiol. 1987.PMID: 3120845
Grosman H, St Louis EL, Gray RR.Grosman H, et al. Among authors: gray rr.Can Assoc Radiol J. 1987 Sep;38(3):183-9.Can Assoc Radiol J. 1987.PMID: 2958466