BATA RINGAN, BATA PUTIH--CELCON,HEBEL , BRICH

http://www.hhcelcon.co.uk/c/document_library/get_file?folderId=54641&name=DLFE-4811.pdf

http://kth.diva-portal.org/smash/get/diva2:13029/FULLTEXT01                  -THESIS