Losses due to the excitation and propagation of magnetoelastic waves in a nonuniform field (in a magnetised rod of single-crystal yttrium iron garnet in the frequency range 500–1500MHz): Mironov, S.A., Gurevich, A.G., Shevlyagin, K.V., Lebed, B.M. Soviet Physics—Solid State, Vol 10, No 6 (December 1968) pp 1408–1411 (1071)