https://www.ifsqn.com/forum/index.php/calendar/event/526-statistical-process-control-spc-and-food-safety-management/?forcePrint=1&forcePrint=1&forceDownload=1&_k=880ea6a14ea49e853634fbdc5015a024&forceDownload=1&_k=880ea6a14ea49e853634fbdc5015a024