DESIGN, FABRICATION AND PERFORMANCE EVALUATION OF A PORTABLE HAND-HELD REFRACTOMETER. Nigerian Journal of Technology, [S. l.], v. 37, n. 2, p. 534–542, 2018. DOI: 10.4314/njt.372.1688. Disponível em: https://nijotech.com/index.php/nijotech/article/view/1688. Acesso em: 16 apr. 2026.