FILIPCZYŃSKI, Leszek. Detectability of blood vessels by means of the ultrasonic echo method using a focused ultrasonic beam. Archives of Acoustics, [S. l.], v. 7, n. 3-4, p. 253–270, 1982. Disponível em: https://acoustics.ippt.pan.pl/index.php/aa/article/view/3286. Acesso em: 25 feb. 2026.