@techreport{weko_81144_1, author = "Yoshinori,Kitatsuji and Hidetoshi,Yokota", title = "On Workload Reduction of IMS in Severely Congested Situation", year = "2012", institution = "KDDI R&D Laboratories, Inc., KDDI R&D Laboratories, Inc.", number = "30", month = "mar" }