“COMPARISON OF THE EFFECT OF SILDENAFIL AND TADALAFIL ON PULMONARY HYPERTENSION ASSOCIATED WITH HEMODYNAMICALLY SIGNIFICANT PDAS TREATMENT OF PULMONARY HYPERTENSION IN HS-PDA PATIENTS”. Journal of Pharmaceutical Negative Results, Dec. 2022, pp. 3266-74, https://www.pnrjournal.com/index.php/home/article/view/4563.