S. GUPTA;S. K. VISHWAKARMA;D. K. MAJHI;S. KUNDU . Influence of linearly varying density and rigidity on torsional surface waves in inhomogeneous crustal layer[J]. Applied Mathematics and Mechanics, 2012 , 33(10) : 1239 -1252 . DOI: 10.1007/s10483-012-1618-7

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