POWAŁOWSKI, T. An ultrasonic C.W. doppler method of measurement of the blood flow velocity. Archives of Acoustics, [S. l.], v. 6, n. 3, p. 287–306, 1981. Disponível em: http://acoustics.ippt.gov.pl/index.php/aa/article/view/3314. Acesso em: 18 apr. 2026.