\Bibitem{GumIva85} \by N.~A.~Gumerov, A.~I.~Ivandaev \paper Singularities of high-frequency acoustic perturbation propagation in steam and gas suspensions \jour Prikl. Mekh. Tekh. Fiz. \yr 1985 \vol 26 \issue 6 \pages 73--81 \mathnet{http://mi.mathnet.ru/pmtf5382} \transl \jour J. Appl. Mech. Tech. Phys. \yr 1985 \vol 26 \issue 6 \pages 823--830 \crossref{https://doi.org/10.1007/BF00919531}