XV Meždunarodna XV Meždunarodna naučna konferencija VSU´2015 : dokladi. Tom I, Sofia, Bulgaria, 4. - 5. 6. 2015 / rec. Ventseslav Stoyanov, Margarita Hamova. -- Sofia : University of Structural Engineering and Architecture "L.Karavelov", 2015. -- 412 s. -- ISSN : 1314-071X. Stoyanov, Ventseslav. Hamova, Margarita