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Ra, Ho Jong, et al. "Betulin Suppressed Interleukin-1β-induced Gene Expression, Secretion and Proteolytic Activity of Matrix Metalloproteinase in Cultured Articular Chondrocytes and Production of Matrix Metalloproteinase in the Knee Joint of Rat." Korean J Physiol Pharmacol 2017.

Ra, Ho Jong, et al. "Betulin Suppressed Interleukin-1β-induced Gene Expression, Secretion and Proteolytic Activity of Matrix Metalloproteinase in Cultured Articular Chondrocytes and Production of Matrix Metalloproteinase in the Knee Joint of Rat." Korean J Physiol Pharmacol 2017.