NARANG, T. D.; SINGH, S. P. BEST COAPPROXIMATION IN METRIC LINEAR SPACES. Tamkang Journal of Mathematics, [S. l.], v. 30, n. 4, p. 241–252, 1999. DOI: 10.5556/j.tkjm.30.1999.4198. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4198. Acesso em: 27 apr. 2024.