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2. Excerpt from the obituary of John Joseph Holland 1876–1959;J. Telemed. Telecare,1997
3. On the transmission of ECG over telephone channel (Russian);Ianushkevichus;Klin. Med. (Mosk),1965
4. Function and significance of telephone electrocardiography in medical practice (German);Prossner;Z. Gesamte Inn. Med.,1966
5. Two way television in group therapy;Wittson;Mental Hospitals,1961