“…Over the past several decades, numerous scientific papers and books have addressed the problem of the evaluation of the shelf life of pharmaceuticals, see, for example, the book edited by Carstensen and Rhodes [12], comprehensive reviews of Kartoglu and Milstien [13], the book of Waterman [14] and his papers [15,16], or recent publications of Fan et al [17], Fu et al [18], Almalik et al [19], Faya et al [20], Khan et al [21], Clénet et al [22,23], or Clancy et al [24].…”