1. Department of Construction Economics and Property Management, Vilnius Gediminas Technical University, Saulėtekio al. 11, LT-10223 Vilnius, Lithuania
2. Department of Construction Technology and Management, Vilnius Gediminas Technical University, Saulėtekio al. 11, LT-10223 Vilnius, Lithuania
3. Civil Engineering Institute of Saint-Petersburg State Polytechnical University, Polytehnicheskaya 29, 195251 Saint Petersburg, Russia