Chengyao Wang Dingwei Wang W. H. Ip D. W. Yuen The single machine ready time scheduling problem with fuzzy processing times. 117-129 2002 127 Fuzzy Sets and Systems 2 http://www.sciencedirect.com/science/article/B6V05-45D2G56-2/2/74053623d796568c6fae7b3009c1d7af db/journals/fss/fss127.html#WangWIY02