Lefebvre, V., & Vaes, G. (1989). The Enzymatic Evaluation of Procollagenase and Collagenase Inhibitors in Crude Biological Media. Biochimica et Biophysica Acta : international journal of biochemistry and biophysics, 992(3), 355-361. https://hdl.handle.net/2078.5/138906 (Original work published 1989)