1. Koenker R, Quantite Regression, Cambridge University Press, New York, 2005.
2. Yu K, Lu Z, and Stander J, Quantile regression: Applications and current research areas, Journal of the Royal Statistical Society, Series D, 2003, 52: 331–350.
3. Fan J and Li R, Variable selection via non-concave penalized likelihood and its oracle properties, Journal of the American Statistical Association, 2001, 96: 1348–1360.
4. Tibshirani R J, Regression shrinkage and selection via the Lasso, Journal of the Royal Statistical Society, Ser. B, 1996, 58: 267–288.
5. Tian M Z and Chen G M, Hierarchical linear regression models for conditional quantiles, Science in China Series A: Mathematics, 2006, 49: 11–16.