Lazov, L., Teirumnieka, E., Teirumnieks, E., Atanasova, N., & Karadzhov, T. (2019). ON-LINE PROFESSIONAL TRAINING FOR WORKERS WITH THE MOODLE SYSTEM TO IMPROVE PROFESSIONAL SKILLS IN GREEN CONSTRUCTIONS. SOCIETY. INTEGRATION. EDUCATION. Proceedings of the International Scientific Conference, 5, 393-402. https://doi.org/10.17770/sie2019vol5.3908