Pecchia, Leandro; Castaldo, Rossana; Montesinos, Luis; Melillo, Paolo: 'Are ultra-short heart rate variability features good surrogates of short-term ones? State-of-the-art review and recommendations', Healthcare Technology Letters, 2018, 5, (3), p. 94-100, DOI: 10.1049/htl.2017.0090
IET Digital Library, https://digital-library.theiet.org/;jsessionid=6diofd5c0cgho.x-iet-live-01content/journals/10.1049/htl.2017.0090