. . . . . . . . . . . . . . . . . . "experimental"@en . . . . . "479-61-8"@en . "Charles R. Booth, Dale A. Kiefer, \"Method and apparatus for determining concentrations of chlorophyll and the rate of primary production in water.\" U.S. Patent US4804849, issued February, 1983."@en . . . . . . . "Chlorophyll A"@en . . . . . . . .