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Tannast, Moritz; Siebenrock, Klaus A.; Anderson, Suzanne E. (2007). "Femoroacetabular Impingement: Radiographic Diagnosis—What the Radiologist Should Know". American Journal of Roentgenology. 188 (6): 1540–1552. doi:10.2214/AJR.06.0921. PMID17515374.
Kamegaya, Makoto; Saisu, Takashi; Nakamura, Junichi; Murakami, Reiko; Segawa, Yuko; Wakou, Masanori (2011). "Drehmann Sign and Femoro-acetabular Impingement in SCFE". Journal of Pediatric Orthopaedics. 31 (8): 853–857. doi:10.1097/BPO.0b013e31822ed320. PMID22101663. S2CID205500941.
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Kamegaya, Makoto; Saisu, Takashi; Nakamura, Junichi; Murakami, Reiko; Segawa, Yuko; Wakou, Masanori (2011). "Drehmann Sign and Femoro-acetabular Impingement in SCFE". Journal of Pediatric Orthopaedics. 31 (8): 853–857. doi:10.1097/BPO.0b013e31822ed320. PMID22101663. S2CID205500941.