１Title:EWMA control charts with variable sample sizes and variable sampling intervals Author:Marion R. Reynolds and Jesse C. Arnold
ISource:IE Transactions
Volume 33, Number 6, 511-530, DOI: 10.1023/A:1007698114122
Link: http://www.springerlink.com/content/f84hh0q2uknecwwe/

2
Title:CUSUM control chart with variable sampling scheme
by Lam, Veng Va, Ph.D., Colorado State University, 1996, 182 pages; AAT 9710071
Link:http://proquest.umi.com/pqdweb?index=0&;did=739523561&SrchMode=1&sid=1&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1304734960&clientId=48958

or Link:http://proquest.umi.com/pqdweb?S ... ling+intervals.&;date=ALL&onDate=&beforeDate=&afterDate=&fromDate=&toDate=&TITLE=&author=&SCH=&subject=&FT=0&LA=any&MTYPE=all&sortby=REVERSE_CHRON&RQT=305&querySyntax=PQ&searchInterface=1&moreOptState=CLOSED&TS=1304734940&h_pubtitle=&h_pmid=&clientId=48958&JSEnabled=1

第二篇可以直接点击题目链接！！