Šimkovič, Vladimír, 1953- User Tracking in VR Environment / aut. Vladimír Šimkovič, Viliam Zajíček, Roman Hajtmanek. -- 2-s2.0-85066911416. -- 000470238300017. Zajíček, Viliam, 1989-. Hajtmanek, Roman, 1991- In: Proceedings - 2019 International Conference on Engineering Technologies and Computer Science. -- 1. vydanie. -- 127 s.. -- 978-1-7281-1915-1 2019 International Conference on Engineering Technologies and Computer Science.. -- Piscataway, USA : Institute of Electrical and Electronics Engineers, 2019. -- S. 80-84.