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3. Duplex and color Doppler sonographic evaluation of vasculogenic impotence;Quam;A JR,1989
4. Vascular evaluation of impotence in men. Duplex ultrasound scanning and pharmacologic caverno-sometry/cavernosography;Jarow;Probl. Urol,1989
5. Erection: physiology and endocrinology;Wagner,1981