RIEČANOVÁ, Z.; ZAJAC, M. Extensions of Effect Algebra Operations. Acta Polytechnica, [S. l.], v. 51, n. 4, 2011. DOI: 10.14311/1410. Disponível em: https://ojst.is.cvut.cz/ojs/index.php/ap/article/view/1410.. Acesso em: 13 may. 2025.