@misc {IOPORT.70922216,
    author       = {Chen, Ying-Ju and Zhao, Xiaojian},
    title        = {Contractual traps},
    howpublished = {TARK, 51-60 (2009).},
    year         = {2009},
    doi          = {10.1145/1562814.1562825},
    identifier   = {70922216},
}