Biriukovich, A A <br/><br/>
[Variations of the heart rate during nocturnal sleep in preschool and school children].  [electronic resource] 

 -  Pediatriia  Feb 1969 
 - 81-2 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0031-403X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Adolescent<br/>Child<br/>Electrocardiography<br/>Female<br/>Heart Rate<br/>Humans<br/>Male<br/>Sleep