Xianqping Liu Liu, X., Taylor, L. O., Hamilton, T. L., & Grigelis, P. E. (2013). Amenity values of proximity to National Wildlife Refuges: An analysis of urban residential property values. ECOLOGICAL ECONOMICS, 94, 37–43. https://doi.org/10.1016/j.ecolecon.2013.06.011 Liu, X., Nestic, D., & Vukina, T. (2012). ESTIMATING ADVERSE SELECTION AND MORAL HAZARD EFFECTS WITH HOSPITAL INVOICES DATA IN A GOVERNMENT-CONTROLLED HEALTHCARE SYSTEM. HEALTH ECONOMICS, 21(8), 883–901. https://doi.org/10.1002/hec.1756 Liu, X. P., & Lynch, L. (2011). Do agricultural land preservation programs reduce farmland loss? Evidence from a propensity score matching estimator. Land Economics, 87(2), 183–201. Liu, X. P., & Lynch, L. (2011). Do zoning regulations rob rural landowners' equity? American Journal of Agricultural Economics, 93(1), 1–25.