标题：Active learning of causal networks with intervention experiments and optimal designs

作者：He, Y. and Geng, Z. (2008)

标题：Identifiability and estimation of causal effects in randomized trials with noncompliance and completely non-ignorable missing-data (with discussion)

作者：Chen, H., Geng, Z. and Zhou, X. (2008)

标题：Criteria for surrogate end points

作者：Chen, H., Geng, Z. and Jia, J. (2007)