Chen, Pu (2010): A grouped factor model. Unpublished.
Chen, Pu (2010): A Grouped Factor Model. Unpublished.
Chen, Pu (2010): A time series causal model. Unpublished.
Chen, Pu (2012): Common factors and specific factors. Unpublished.
Chen, Pu and Hsiao, Chih-Ying (2010): Looking behind Granger causality. Unpublished.
