For citations:

Volkov A.V., Yudkina N.N., Nasonov E.L. Long-Term Prospective Observation Study of Patients with Pulmonary Arterial Hypertension Associated with Connective Tissue Diseases. Kardiologiia. 2025;65(4):23-30. (In Russ.) https://doi.org/10.18087/cardio.2025.4.n2919