30th International Conference on Organization and Technology of Maintenance (OTO 2021) : Proceedings of 30th International Conference on Organization and Technology of Maintenance (OTO 2021) - Glavas, Hrvoje; Ademović, Naida; Avdaković, Samir; Hadzima-Nyarko, Marijana; Karakasić, Mirko (Cham Springer International Publishing AG, 2021)