BROWN, M. R.; VONRAMM, O. T.; STASKO, R. R. Three Techniques of Spectral Analysis in Electrocardiograms. CMBES Proceedings, [S. l.], v. 3, 1970. Disponível em: https://proceedings.cmbes.ca/index.php/proceedings/article/view/800. Acesso em: 20 may. 2024.