DEMIÁN, Tamás. Spectral conditions for Phase-type representations. Periodica Polytechnica Electrical Engineering, [S. l.], v. 54, n. 1-2, p. 11–19, 2010. 10.3311/pp.ee.2010-1-2.02. Disponível em: https://pp.bme.hu/ee/article/view/816. Acesso em: 19 may. 2024.