McDonald, R D <br/><br/>
A heart rate meter for measurement of instantaneous and average rates.  [electronic resource] 

 -  Medical & biological engineering  May 1966 
 - 291-8 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0025-696X 
<br/><br/><label>Standard No.: </label>10.1007/BF02474805  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Heart Function Tests--instrumentation<br/>Heart Rate