@ARTICLE{Xu2018:Orthoginal, 
author={Xinxing Xu and Shijie Xiao and Zhang Yi and Xi Peng and Yong Liu}, 
journal={IEEE Transactions on Cognitive and Developmental Systems}, 
title={Orthogonal Principal Coefficients Embedding for Unsupervised Subspace Learning}, 
year={2017}, 
volume={10}, 
number={2}, 
pages={280-289}, 
doi={10.1109/TCDS.2017.2686983}, 
month={June},}

@ARTICLE{Xu2018:Orthoginal:abbv, 
author={Xinxing Xu and Shijie Xiao and Zhang Yi and Xi Peng and Yong Liu}, 
journal={IEEE Trans. on Cognitive and Developmental Systems}, 
title={Orthogonal Principal Coefficients Embedding for Unsupervised Subspace Learning}, 
year={2017}, 
volume={10}, 
number={2}, 
pages={280-289}, 
doi={10.1109/TCDS.2017.2686983}, 
month={Jun.},}