IVANOV, V.; Kolesnyk–ú. EFFECT OF COMBINED ORAL FERROTHERAPY WITH L-CARNITINE ON EXERCISE TOLERANCE OF PATIENTS WITH CHRONIC HEART FAILURE WITH REDUCED EJECTION FRACTION OF LEFT VENTRICLE WITH CONCOMITANT IRON DEFICIENCY ANEMIA. EUREKA: Health Sciences, n. 6, p. 22-29, 3 Dec. 2019.