3Lundstrow T, Moor E, Ryden L,Differential effects of xamoterrol and verapamil on ventricular rate tegulation in patiwnts with chronic atrial fibrillation. Am Heart J,1992, 124:197-203.
4Furian R,Guzzetti S,Crivellaro W,et al.Continuous 24-hour assessment of the neural regulation of systemic arterial pressure and RR variabilities in ambulant subjects.Ciuculation, 1990, 81: 537-547.