Pounds N, Maclean S, Webley M, Pascoe D, Hutchinson T. Acute and chronic effects of ibuprofen in the mollusc Planorbis carinatus (Gastropoda: Planorbidae). Ecotoxicology and Environmental Safety. 2008 May;70(1):47–52. doi: 10.1016/j.ecoenv.2007.07.003.