O. Ignatkina і M. Yabluchansky, «TYPE OF REACTION OF SIMPATO-VAGAL BALANCE IN A ACUTE FARM TEST WITH A METOPROLOL AND EFFICIENCY OF THERAPY OF HEART FAILURE», J. V. N. Karazin Khark. Nat. Univ., Ser. Med., вип. 4, с. 14-17, 1.