DIMITROV, Dimitar - IVANOVA, Mariyana. Trends in Organic Farming Development in Bulgaria: Applying Circular Economy Principles to Sustainable Rural Development. In Visegrad Journal on Bioeconomy and Sustainable : International Scientific Journal. - Nitra : Slovak University of Agriculture in Nitra, 2017. ISSN 1339-3367, 2017, vol. 6, no. 1, s. 10-16.