Greczek-Stachura, M., P. Zagata Leśnicka, and M. Ślęczka. “Analysis of the Coliform in the Wilga River (southern Poland)”. Annales Universitatis Paedagogicae Cracoviensis Studia Naturae, vol. 1, no. 1, Dec. 2016, pp. 190–195, https://aupcstudianaturae.uken.krakow.pl/article/view/5403.