Some results for identification for sourses and its extension to liar models. Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, [S. l.], v. 99, p. 69–73, 2009. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/112. Acesso em: 15 dec. 2025.