doi          = "10.1007/978-3-642-11957-6\_8",
 doi          = "10.1145/1932681.1863592",
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 doi          = "10.1145/165180.165214",
 doi          = "10.1145/982962.964010",
 doi          = "10.1007/3-540-61055-3\_38",
 doi          = "10.1109/TC.2001.970569",
 doi          = "10.1145/99370.99381",
 doi          = "10.1093/logcom/5.4.495",
 doi          = "10.1007/978-3-642-02273-9\_22",
 doi          = "10.1145/583852.581491",
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