Rohren EM, Kliewer MA, Carroll BA, Hertzberg BS (December 2003). "A spectrum of Doppler waveforms in the carotid and vertebral arteries". AJR. American Journal of Roentgenology. 181 (6): 1695–1704. doi:10.2214/ajr.181.6.1811695. PMID14627599.
Rohren EM, Kliewer MA, Carroll BA, Hertzberg BS (December 2003). "A spectrum of Doppler waveforms in the carotid and vertebral arteries". AJR. American Journal of Roentgenology. 181 (6): 1695–1704. doi:10.2214/ajr.181.6.1811695. PMID14627599.