Soskova A, Soskov I. CO-SPECTRA OF JOINT SPECTRA OF STRUCTURES. Ann. Sofia Univ. Fac. Math. and Inf. [Internet]. 2004 Dec. 12 [cited 2024 Nov. 21];96:35-44. Available from: https://ftl5.uni-sofia.bg/index.php/fmi/article/view/159