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Problems and SolutionsMichael W. Ecker, Richard Johnsonbaugh, Sidney Penner, Larry Hoehn, Thomas E. Elsner, Peter A. Lindstrom, D. L. Muench, R. S. Luthar, Ernest W. Fox, Gregory P. Wene, Ragnar Dybvik, Adam Riese, Sidney Penner, Landy Godbold, Martin Berman, Robert Cornell, Allan Kaufman, Steve Kahn and Blair Spearman · The Two-Year College Mathematics Journal · 1978