BHATIA, V. B. Tools of Astronomy Author Biman Basu. SCHOOL SCIENCE, [S. l.], v. 49, n. 2, p. p.80–82, 2011. Disponível em: http://ejournals.ncert.gov.in/index.php/SS/article/view/1017. Acesso em: 23 aug. 2025.