Saponins from Astragalus pycnocephalus var. pycnocephalus FISCHER and their α/β-glucosidase inhibitory effects - Koz, Ö; Ekinci, D; Şentürk, M; Perrone, A; Piacente, S; Alankuş Çalışkan, Ö; Bedir, E (Planta Medica, 2011)