Employee performance, working time and tiredness in creative R&D jobs : employee survey from EstoniaHazak, Aaro; Virkebau, Marko; Tuulik, Viiu; Tint, Piia; Pille, Viive; Sõõru, ErveSpringer Proceedings in Business and Economics2018 / p. 321 - 330 https://doi.org/10.1007/978-3-319-70377-0_22 Conference Proceedings at Scopus Article at Scopus