1. Comments on “Free vibration analysis of circular annular plates with non-uniform thickness by the differential quadrature method”;Laura;Journal of Sound and Vibration,1996
2. Comments on “Free vibration analysis of annular plates by the DQ method”;Larrondo;Journal of Sound and Vibration,1994
3. D.R. Avalos, H.A. Larrondo, V. Sonzogni, P.A.A. Laura, General approximate solution of the problem of free vibrations of annular plates of non-uniform thickness, Institute of Applied Mechanics, Bahi Bianca, Argentina, Publication No. 96-7, 1995.
4. A.W. Leissa, Vibration of Plates (NASA SP 160), US Government Printing Office, Washington, DC, 1969.
5. Free vibration analysis of annular plates by the DQ method;Wang;Journal of Sound and Vibration,1993