ADDENDUM TO &&NONLINEAR VIBRATIONS OF SIMPLY SUPPORTED, CIRCULAR CYLINDRICAL SHELLS, COUPLED TO QUIESCENT FLUID''

This letter is related to the paper of Amabili et al. (1998) and is written for three reasons: (i) to explain better the approximation on tangential boundary conditions used in this paper, (ii) to complete the literature review therein with additional papers, (iii) to correct a few misprints.