van Tonder M, de Beer DJ, Wichers H. A QUALITY ASSURANCE FRAMEWORK FOR SULPHONIC ACID-COATED SAND USED IN 3D PRINTING APPLICATIONS. S AFR J IND ENG [Internet]. 2020Nov.11 [cited 2024Apr.27];31(3):218-29. Available from: http://sajie.journals.ac.za/pub/article/view/2447