SHAFUDAH, N.; SINGH, S. An inexpensive new multipurpose refrectometer. International Science and Technology Journal of Namibia, [S. l.], p. 036–040, 2015. Disponível em: https://journals.unam.edu.na/index.php/ISTJN/article/view/1163. Acesso em: 21 may. 2024.