1. Ab Razak I. A. (1999) Combined sewer overflows and water quality before and after deep tunnels operation in Milwaukee, Wisconsin. Ph.D. Thesis, Department of Civil Engineering and Mechanics, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin.
2. Statistics for Environmental Engineers;Berthouex,1994
3. Applied Nonparametric Statistics;Daniel,1990
4. Statistical Methods for Environmental Pollution Monitoring;Gilbert,1987
5. Methods of discharge compensation as an aid to the evaluation of water quality trends;Harned;Water Resources Research,1981