Grigorov, B., Vassilev, K., Velev, N. and Assenov, A. 2016. The Contradiction between Taxa of Conservation Significance and Invasive Species – a Case Study of Sustainable Development in Mala Planina. European Journal of Sustainable Development. 5, 4 (Oct. 2016), 464. DOI:https://doi.org/10.14207/ejsd.2016.v5n4p464.