TIEES 2020: Trends and Innovations in E-Business, Education and Security Eighth International Scientific Web-Conference of Scientists and PhD. Students or Candidates - Rajnai, Zoltán; Schmidt, Peter, 1968-; Jurík, Pavol, 1987-; Ancza, Erzsébet; Bandurič, Igor, 1980-; Doucek, Petr (Óbuda University, 2020)