@TechReport{economics.dp.2007-15,
 author = {Chen, Pu and Chihying , Hsiao},
 title = {Learning Causal Relations in Multivariate Time Series Data},
 type = {Economics Discussion Paper},
 institution = {Kiel Institute for the World Economy},
 year = {2007},
 number = {2007-15},
 url = {http://www.economics-ejournal.org/economics/discussionpapers/2007-15}
}