المؤلفون: Murrell GAC, Coonrad RW, Moorman CT III, Fitch RD, Murrell, G A, Coonrad, R W, Moorman, C T 3rd, Fitch, R D

المصدر: Spine (03622436); 1993 May, Vol. 18 Issue 6, p709-712, 4p