SOLOVJOVAS, Nikolajus. Prognoses and Social Planning. Problemos, [S. l.], v. 7, p. 109–114, 1971. DOI: 10.15388/Problemos.1971.7.5819. Disponível em: https://www.journals.vu.lt/problemos/article/view/5819.. Acesso em: 8 may. 2024.