1. Alibegović-Grbić S., Čivić H., Bezdrob M. (2004): The influence of the use of lower nitrogen and plant development stages in mowing on the yield of dry matter and crude proteins from the grassland. Acta Agriculturae Serbica, 17: 497-293.;
2. Djukić D., Stevovic V., Đurovic D., Ilic O. (2008): The effect of organic fertilizer on biomass yield and quality of natural meadows. Options mediterraneennes, Sustainable Mediterranean Grasslands and their Multi-Functions, 78: 431-434.;
3. Dubljević R. (2007): The influence of nitrogen fertilization on the production characteristics of Agroseietum vulgaris meadows in the hilly area of the Polimlje. Proceedings, XI Symposium on Forage Crops of the Republic of Serbia, Novi Sad, Serbia, 44 (1): 355-360.;
4. Frink C.R., Waggoner P.E., Ausubel J.H. (1999): Nitrogen fertilizer: retrospect and prospect. PNAS, 96: 1175-1180.;
5. Gough L., Osenberg C.W., Gross K.L., Collins S.L. (2000): Fertilization effects on species density and primary productivity in herbaceous plant communities. Oikos, 89: 428-439.;