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Title:Combined double sampling and variable sampling interval X chart
Source:International Journal of Production Research
Volume 40, Issue 9, 2002, Pages 2175 - 2186
Authors: V. Carot; J. M. Jabaloyes; T. Carot
DOI: 10.1080/00207540210128260
Link:http://www.informaworld.com/smpp ... ~content=a713847107