http://pec.lib.wvu.edu/record/P169171939Determination of uric acid in the mixed excrements of birds : a modification of the Fritz differential extraction method. Journal article reprint from: <em>Industrial and Engineering Chemistry (Analytical ed.</em>), v.11 (1939:July 15). Van Landingham, Audrey Howard, b. 1905.Shirley, Ray L.Uric acid.Birds.Feces.14256