title: [Psychological principles of active relaxation in lengthy cosmic flights].
mesh_terms: D001877:Books; D006801:Humans; D009040:Motion Pictures; D009146:Music; D012063:Relaxation; D013026:Space Flight
vernacular_title: O psikhologicheskikh printsipakh aktivnogo otdykha v dlitel'nukh kosmicheskikh poletakh.