1. P. W. Anderson, S. D. Faust, and J. S. Zogorski, 1968 . Analyses of long-term trends in water-quality parameters . Amer. Water Resources Assoc. 4th Annual Conf. Proc., pp. 123 -131 .
2. S. D. Faust, and P. W. Anderson, 1970 . Twenty-five year trends toward deterioration of quality in a polluted river . Amer. Soc. of Limnology and Oceanography, 33rd Annual Meeting.