1. H. A. SNELLEN: A Disorder of the Breast, Collection of original texts on ischaemic heart disease. Rotterdam 1976.
2. G.E. BURCH and N.P. DEPASQUALE: A History of Electrocardiography. Chicago 1964.
3. A.D. WALLER: A demonstration on man of electromotive changes accompanying the heart’s beat. J. Physiol
8:17, 1887.
4. A. D. WALLER: The electromotive properties of the human heart. Brit. Med. J.: Oct. 6, 731, 1888.
5. A. D. WALLER: On the electromotive changes with the Beat of the Mammalian Heart, and of the Human Heart in particular. Phil. Transact. Royal Soc. London. 180:169, 1890.