Industry 4.0 : Business & Industry 4.0 : Society & Industry 4.0. International Scientific Conference. Industry 4.0 : Proceedings: Business & Industry 4.0 : Society & Industry 4.0 : International Scientific Conference : 13.-16. December 2017, Borovets, Bulgaria. Volume 2. 1st edition. Sofia : Scientific-Technical Union of Mechanical Engineering Industry 4.0, 2017. online [283 s.]. ISSN 2535-0153.