Silviu, B., S. Nistor, E. Popa Oana, and I. Alecu. “Aspects of Sustainable Rural Development in the Mountain Areas from N-E Region of Romania”. Economics of Agriculture, vol. 57, no. Spec.num.2, Dec. 2010, pp. 33-38, https://www.ea.bg.ac.rs/index.php/EA/article/view/911.