HUSÁR, Jozef et al. The concept of the LMS system for teaching subjects from the field of industry 4.0 based on augmented reality. In EDULEARN21 : Proceedings : 13th International Conference on Education and New Learning Technologies : Online Conference. 5-6 July, 2021. 1. vyd. Valencia : IATED Academy, 2021, S. 2779-2786. ISSN 2340-1117. ISBN 978-84-09-31267-2.