Comments on: “Energetic balance for the Rayleigh–Stokes problem of an Oldroyd-B fluid” [Nonlinear Anal. RWA 12 (2011) 1]

We point out that an erroneous derivation in the recent paper [C. Fetecau et al. Energetic balance for the Rayleigh–Stokes problem of an Oldroyd-B fluid, Nonlinear Anal. RWA 12 (2011) 1–13] yields a correct solution by accident. Additionally, a number of misrepresentations and inaccuracies in the latter recent paper are identified, corrected and/or clarified in this Comment. Finally, a listing of recent papers in this journal in which a mistake occurs while applying the Fourier sine transform, and thus present erroneous solutions, is given as an Appendix.