Anti-elastase and anti-hyaluronidase activities of saponins and sapogenins from Hedera helix, Aesculus hippocastanum, and Ruscus aculeatus: factors contributing to their efficacy in the treatment of venous insufficiency - Facino, R M; Carini, M; Stefani, R; Aldini, G; Saibene, L (Arch Pharm, 1995)