Authors
Rositsa Petkova-Slipets
Department of Civil Engineering, Faculty of Architecture, Varna Free University “Hrabar”, Bulgaria
Penka Zlateva
Department of Thermal Engineering, Shipbuilding Faculty, Technical University of Varna, Varna, Bulgaria
© 2017 Rositsa Petkova-Slipets, Penka Zlateva, published by University of Žilina
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.