KOKNE, P.; ARDAD, A. AN INTRODUCTION TO VARIABLE STARS IN ASTRONOMY. Innovare Journal of Sciences, [S. l.], v. 8, n. 7, p. 75–77, 2020. Disponível em: https://innovareacademics.in/journals/index.php/ijs/article/view/38536. Acesso em: 27 nov. 2021.