GOPALAN, M.; VIDHYALAKSHMI, S.; PREMALATHA, E. Three Fascinating Pairs. Journal of Asian Scientific Research, [S. l.], v. 7, n. 6, p. 231–239, 2017. DOI: 10.18488/journal.2.2017.76.231.239. Disponível em: https://archive.aessweb.com/index.php/5003/article/view/3823. Acesso em: 19 may. 2024.