\Bibitem{Sul84} \by K.~S.~Sultanov \paper Longitudinal wave propagation in a viscoelastic semispace including an absorbing layer \jour Prikl. Mekh. Tekh. Fiz. \yr 1984 \vol 25 \issue 5 \pages 137--142 \mathnet{http://mi.mathnet.ru/pmtf5565} \transl \jour J. Appl. Mech. Tech. Phys. \yr 1984 \vol 25 \issue 5 \pages 790--795 \crossref{https://doi.org/10.1007/BF00909388}