1. Davis , M.
Parnell , E. W.
Sharp , B. W.
Warburton , D. Methyl and ethyl 6- and 7-substituted 4-hydroxy-quinoline-3-carboxylates useful as coccidiostats. US Patent 485845, Dec. 23, 1969 .
2. Watson , E. J. Lower alkyl esters of 6,7-di (lower) alkoxy-4-hydroxy-3-quinoline-carboxylic acid. US Patent 3,267, 106 Aug. 16, 1966 .
3. Watson , E. J. Coccidial compositions containing lower alkyl esters of 6,7-di (lower) alkoxy-4-hydroxy-3-quinoline-carboxylic acid. US Patent 3,316,147 Apr. 25, 1967 .