GRAUMANN, Günter. The problem field of calendars in different cultures. LUMAT: International Journal on Math, Science and Technology Education, [S. l.], v. 3, n. 1, p. 151–161, 2015. DOI: 10.31129/lumat.v3i1.1057. Disponível em: https://journals.helsinki.fi/lumat/article/view/1057. Acesso em: 22 dec. 2024.