1. Choquette A. F. (1988). “Regionalization of peak discharges for streams in Kentucky.” Water Resources Investigations Report 87‐4209 U.S. Geological Survey Louisville District Louisville Ky.
2. Darymple T. (1960). “Flood frequency analysis.” Manual of hydrology Part 3 U.S. Geological Survey Water‐Supply Paper 1543‐A Government Printing Office Washington D.C.
3. “Guidelines for determining flood flow frequency.” (1982). Bulletin 17‐B U.S. Department of the Interior Hydrology Subcommittee Interagency Advisory Committee on Water Data U.S. Geological Survey Reston Va.
4. Houghton J. C. (1977). “Robust estimation of the frequency of extreme events in a flood frequency context ” dissertation presented to Harvard University at Cambridge Mass. in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
5. Milligan G. W. and Cooper M. C. (1983). “An examination of procedures for determining the number of clusters in a data set.” College of Administrative Science Working Paper Series 83‐51 Ohio State Univ. Columbus Ohio.