@article {Kokai_diagnosisof, title = {Diagnosis of Heart Diseases with the Help of the {PECG} System}, journal = {Annals of Noninvasive Electrocardiology}, volume = {3}, number = {2-3}, year = {1998}, pages = {58}, author = {G. K{\'o}kai and A. Thury and Tibor Gyim{\'o}thy and J. Csirik and M. Csan{\'a}dy} }