%0 Journal Article %A K. N. Zhuikov %A A. Yu. Savin %T On two methods of determining $\eta$-invariants of elliptic boundary-value problems %J Contemporary Mathematics. Fundamental Directions %D 2024 %P 403-416 %V 70 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMFD_2024_70_3_a4/ %G ru %F CMFD_2024_70_3_a4