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Ambrose KR, Owen BA, Callahan AP, Goodman MM, Knapp FF Jr.Ambrose KR, et al.Int J Rad Appl Instrum B. 1988;15(6):695-700. doi: 10.1016/0883-2897(88)90063-3.Int J Rad Appl Instrum B. 1988.PMID: 3251902
Goodman MM, Neff KH, Ambrose KR, Knapp FF Jr.Goodman MM, et al. Among authors: ambrose kr.Int J Rad Appl Instrum B. 1989;16(8):813-9. doi: 10.1016/0883-2897(89)90166-9.Int J Rad Appl Instrum B. 1989.PMID: 2621117