Despina-Maria Bordean. "ENRICHMENT OF SOILS: PLAQUE OR AID." SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 13th SGEM GeoConference on ECOLOGY, ECONOMICS, EDUCATION AND LEGISLATION (2013): 361 - 368 pp. https://doi.org/10.5593/sgem2013/be5.v1/s20.048