KRUOPIS, J.; LEVULIENĖ, R. Reliability Estimation when Failure Intensity Depends on Calendar Time. Elektronika ir Elektrotechnika, [S. l.], v. 93, n. 5, p. 35-38, 2009. Disponível em: https://eejournal.ktu.lt/index.php/elt/article/view/10176. Acesso em: 30 sep. 2020.