. "Maleic Acid"@en . "Yasuhisha Fukumoto, Noboru Moriyama, Takashi Itoi, \"Maleic acid copolymer, production thereof and scale-preventing agent containing the same.\" U.S. Patent US4589995, issued August, 1933."@en . . . . . . . . . . . . . . . . . . . "experimental"@en . "110-16-7"@en . . . . . . . . . . . . . . . . . . . .