SOSKOVA, A. PROPERTIES OF CO-SPECTRA OF JOINT SPECTRA OF STRUCTURES. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 97, p. 23–40, 2005. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/142. Acesso em: 22 nov. 2024.