1. Enchev S and Georgieva-Andreeva M, 2013. Study of the effect of some soil herbicides on weeds in Sudanese crops. Scientific Works, Practice, Developments, Innovations, 4-8 (Ru).
2. Epinal C, Dousse S, Lorgeon J, Denis J, Bonhomme R, Carolo P and Charosset A, 2001. Interpretation of genotype and environment interactions for early maize hybrids over 12 years. Crop Science, 41, 663-669.
3. Goranovska S and Yanev M, 2016. Economic efficiency of chemical weed control at corn ecology and health. House of Science and Technique - June 9 ,82-85, Plovdiv, Bulgaria (Bg).
4. Goranovska S, Kalinova Sh and Tahsin N, 2017. Effectiveness of systems of herbicides in maize cultivated at agroecological conditions of Northwest Bulgaria. Journal of Mountain Agriculture on the Balkans, 20, 201-211.
5. Gramatikov B, Penchev P and Gospodinov G, 1997. Influence of the term of sowing on the productivity of maize in the region of Southeastern Bulgaria. Plant-Protection Studies, 3-4, 10-12 (Bg).