[On the problem of sinus arrhythmia in children].
D000293:Adolescent; D000367:Age Factors; D001146:Arrhythmia, Sinus; D002648:Child; D002675:Child, Preschool; D004562:Electrocardiography; D006801:Humans; D007223:Infant
K voprosu o sinusovoĭ aritmii serdtsa u deteĭ.