Carciu, G., L.-G. Circiu, S. Alda, T. Cristea, D. Olaru, and M. Negrea. “Contamination of Surface and Underground Waters by Nitrogen in South-West of Romania”. Review on Agriculture and Rural Development, vol. 2, no. 1, Jan. 2013, pp. 185-9, https://ojs.bibl.u-szeged.hu/index.php/rard/article/view/13305.