1. Electrocardiographic transmission over standard telephone lines;RAHM W. E.;Nebraska M. J.,1952
2. ! MOLY'NEUX L.: Recording low frequency phenomena on magnetic tape. Electronic Engineering 130: March 1952.
3. DUNN F. L. AND RAHM W. E. JR.: Electrocardiography: Modern trends in instrumentation a n d V18ual a n d d l r e o t recording electrocardiograPhv- Ann- Int- M e d - 3 2 : 611« 195°-