1. Fixed effects negative binomial regression models;Allison,2002
2. Estimation of limited dependent variable models with dummy endogenous regressors: simple strategies for empirical practice;Angrist;Journal of Business and Economic Statistics,2001
3. How much should we trust difference in difference estimates?;Bertrand;Quarterly Journal of Economics,2004
4. Box, T., 2005. Incentives May Fuel SUV Sales. The Dallas Morning News.
5. Bradsher, K., 2002. High and Mighty: SUVs: The World’s Most Dangerous Vehicles and How They Got That Way (PublicAffairs).