A. Mažeikienė, M. Valentukevičienė, and J. Jankauskas, “Laboratory study of ammonium ion removal by using zeolite (clinoptilolite) to treat drinking water”, JEELM, vol. 18, no. 1, pp. 54–61, Mar. 2010, doi: 10.3846/jeelm.2010.07.