ZNOJIL, M. The Horizons of Observability in PT-symmetric Four-site Quantum Lattices. Acta Polytechnica, [S. l.], v. 51, n. 4, 2011. DOI: 10.14311/1420. Disponível em: https://ojs.cvut.cz/ojs/index.php/ap/article/view/1420. Acesso em: 3 may. 2024.