Donald M. Marcus؛ Elvin A. Kabat؛ Gerald Schiffman (1964). "Immunochemical Studies on Blood Groups. XXXI. Destruction of Blood Group A Activity by an Enzyme from Clostridium tertium Which Deacetylates N-Acetylgalactosamine in Intact Blood Group Substances". Biochemistry. ج. 3 ع. 3: 437–443. DOI:10.1021/bi00891a023.