Peetersjoris, C., Emondsalt, X., & Vaes, G. (1981). A Direct Simultaneous Plate Assay of Proteoglycan and Collagen Degradation By Cells in Culture and its Application To Synovial-cells. Biochemical Journal, 196(1), 95-104. https://hdl.handle.net/2078.5/145455 (Original work published 1981)