Mandal, S.C., and M.L. Gosh. “Diffraction of Torsional Elastic Waves by a Rigid Annular Disc at a Bimaterial Interface”.
Engineering Transactions
, vol. 41, no. 1, Mar. 1993, pp. 97-116,
https://et.ippt.pan.pl/index.php/et/article/view/1557
.