Comments on: "Starting solutions for some unsteady unidirectional flows   of a second grade fluid," [Int. J. Eng. Sci. 43 (2005) 781]
  A significant mathematical error is identified and corrected in a recent highly-cited paper on oscillatory flows of second-grade fluids [Fetecau & Fetecau (2005). Int. J. Eng. Sci., 43, 781--789]. The corrected solutions are shown to agree identically with numerical ones generated by a finite-difference scheme, while the original ones of Fetecau & Fetecau do not. A list of other recent papers in the literature that commit the error corrected in this Comment is compiled. Finally, a summary of related erroneous papers in this journal is presented as an Appendix. 
Ivan C. Christov, P.M. Jordan
physics.flu-dyn