'Willem Einthoven and the Birth of Clinical Electrocardiography a Hundred Years Ago', S. Serge Barold, Cardiac Electrophysiology Review, Springer Netherlands January 2003 [1]Arxivat 2020-05-11 a Wayback Machine.
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'Willem Einthoven and the Birth of Clinical Electrocardiography a Hundred Years Ago', S. Serge Barold, Cardiac Electrophysiology Review, Springer Netherlands January 2003 [1]Arxivat 2020-05-11 a Wayback Machine.