The anti-arthritic effect of ursolic acid on zymosan-induced acute inflammation and adjuvant-induced chronic arthritis models - Kang, S Y; Yoon, S Y; Roh, D H; Jeon, M J; Seo, H S; Uh, D K; Kwon, Y B; Kim, H W; Han, H J; Lee, H J; Lee, J H (J Pharm Pharmacol, 2008)