LATKIN, K.P.; SMIRNOV, A.S.; KONSTANTINOV, Yu.A.; BURDIN, V.V. The erbium ions absolute concentration measuring technique in active fiber preform. Perm Federal Research Centre Journal, [S. l.], n. 4, p. 21–26, 2018. DOI: 10.7242/1998-2097/2018.4.3. Disponível em: https://journal.permsc.ru/index.php/pscj/article/view/PSCJ2018n4p3. Acesso em: 14 may. 2026.