“…enriching the linear beam model with 'ad hoc' nonlinear terms based on diversely motivated assumptions, are also present beam models rationally derived from an exact geometric representation (Reissner, 1972;Antman, 1977Antman, , 1995. The reader, discouraged by this picture, can consider the points listed here (see Pignataro et al, 1982;Salerno and Lanzo, 1997;Reissner, 1982):…”