OKAI, Takashi. Current and future in FHR monitoring. Nepal Journal of Obstetrics and Gynaecology, [S. l.], v. 2, n. 2, p. 86–88, 2008. Disponível em: https://nepjol.info./index.php/NJOG/article/view/1465. Acesso em: 31 jan. 2025.