Zavadskas, Edmundas, and Artūras Kaklauskas. “Systems Approach in construction—scientific School of A. A. Gusakov (social-Communicative Survey)”. Journal of Civil Engineering and Management 9, no. 4 (December 31, 2003): 253-259. Accessed April 1, 2020. https://journals.vgtu.lt/index.php/JCEM/article/view/9060.