Holovatyi, Y.D. and Hut, V.M. (2012) “Vibrating Systems with Rigid Light-Weight Inclusions: Asymptotics of the Spectrum and Eigenspaces”, Ukrains’kyi Matematychnyi Zhurnal, 64(10), pp. 1314–1329. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2661 (Accessed: 5 December 2025).