DR. PARAMJIT SINGH. Spatial and Temporal Variation of Old Age Group Population in India. International Journal on Future Revolution in Computer Science & Communication Engineering, [S. l.], v. 1, n. 3, p. 17–23, 2015. Disponível em: http://www.ijfrcsce.org/index.php/ijfrcsce/article/view/2047. Acesso em: 6 oct. 2025.