@article{DBLP:journals/compsec/HwangC04a,
author = {Shin-Jia Hwang and
Ching-Chung Chan},
title = {Improvement on Li et al.'s generalization of proxy signature
schemes},
journal = {Computers {\&} Security},
volume = {23},
number = {7},
year = {2004},
pages = {615-619},
ee = {http://dx.doi.org/10.1016/j.cose.2004.06.003},
bibsource = {DBLP, http://dblp.uni-trier.de}
}