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A.A. Zadorozhko, V.K. Chagovets, E.Ya. Rudavskii, G.A. Sheshin, Sh.E. Kekutia, N.D. Chkhaidze, and N. Mulders, The features of the collective modes in aerogels filled with superfluid helium, Low Temp. Phys. 35, (2009) [Fiz. Nizk. Temp. 35, 962-967, (2009)] DOI: https://doi.org/10.1063/1.3253393.