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Merkel JR, Dreisbach JH (July 1978). "Purification and characterization of a marine bacterial collagenase". Biochemistry. 17 (14): 2857–63. doi:10.1021/bi00607a025. PMID210785.
Heindl MC, Fermandjian S, Keil B (July 1980). "Circular dichroism comparative studies of two bacterial collagenases and thermolysin". Biochimica et Biophysica Acta (BBA) - Protein Structure. 624 (1): 51–9. doi:10.1016/0005-2795(80)90224-x. PMID6250633.
Labadie J, Montel MC (January 1982). "[Purification and study of some properties of a collagenase produced by Empedobacter collagenolyticum]". Biochimie. 64 (1): 49–53. doi:10.1016/s0300-9084(82)80609-3. PMID6279175.
Bond MD, Van Wart HE (June 1984). "Characterization of the individual collagenases from Clostridium histolyticum". Biochemistry. 23 (13): 3085–91. doi:10.1021/bi00308a036. PMID6087888.
Bond MD, Van Wart HE (June 1984). "Relationship between the individual collagenases of Clostridium histolyticum: evidence for evolution by gene duplication". Biochemistry. 23 (13): 3092–9. doi:10.1021/bi00308a037. PMID6087889.
Van Wart HE, Steinbrink DR (November 1985). "Complementary substrate specificities of class I and class II collagenases from Clostridium histolyticum". Biochemistry. 24 (23): 6520–6. doi:10.1021/bi00344a032. PMID3002445.
Endo A, Murakawa S, Shimizu H, Shiraishi Y (July 1987). "Purification and properties of collagenase from a Streptomyces species". Journal of Biochemistry. 102 (1): 163–70. doi:10.1093/oxfordjournals.jbchem.a122028. PMID2822678.