MITRIKAS, Algimantas. On Typology of Free Time (I). Problemos, [S. l.], v. 15, p. 48–56, 1975. DOI: 10.15388/Problemos.1975.15.5574. Disponível em: https://www.journals.vu.lt/problemos/article/view/5574. Acesso em: 5 dec. 2025.