Jing Yang Xiyao Kong Cuiping Li Hong Chen Guoming He Jinghua Tian PDA: A Flexible and Efficient Personal Decision Assistant. 455-459 2009 SSTD http://dx.doi.org/10.1007/978-3-642-02982-0_39 conf/ssd/2009 db/conf/ssd/sstd2009.html#YangKLCHT09