BELANGER, G. Maurice. A Visit to Zeiss. Canadian Journal of Optometry, [S. l.], v. 42, n. 2, p. 4, 1980. DOI: 10.15353/cjo.v42i2.4097. Disponível em: https://openjournals.uwaterloo.ca/index.php/cjo/article/view/4097. Acesso em: 24 feb. 2025.