RIEČANOVÁ, Z. Effect Algebras of Positive Self-adjoint Operators Densely Defined on Hilbert Spaces. Acta Polytechnica, [S. l.], v. 51, n. 4, 2011. DOI: 10.14311/1412. Disponível em: https://ojs.cvut.cz/ojs/index.php/ap/article/view/1412. Acesso em: 29 sep. 2023.