For citations:
Volkov A.V., Udkina N.N., Kurmukov I.A., Nikolaeva Ye.A., Nasonov Ye.L. Effect of sildenafil on clinical evidence and hemodynamic parameters in patients with pulmonary arterial hypertension, associated withsystemic rheumaticdiseases. Systemic Hypertension. 2014;11(3):61-66. (In Russ.)