Jianqiang Gao Li-ya Fan Lizhong Xu Median null(<i>S</i><sub><i>w</i></sub>)-based method for face feature recognition. 6410-6419 2013 219 Appl. Math. Comput. 12 https://doi.org/10.1016/j.amc.2013.01.005 db/journals/amc/amc219.html#GaoFX13