A.  Alonso and Camargo, J. A., ?Ammonia toxicity to the freshwater planarian Polycelis felina: contrasting effects of continuous versus discontinuous exposures?, Arch Environ Contam Toxicol, vol. 68, no. 4, pp. 689-95, 2015.

A.  Alonso and Camargo, J. A., ?The freshwater planarian Polycelis felina as a sensitive species to assess the long-term toxicity of ammonia?, Chemosphere, vol. 84, no. 5, pp. 533-7, 2011.