is the number of vehicles
                                (parameter 'l' in the description
                                 in [1]).
          NO = 3.2, 4.1 or 4.2: IPAR(1) is the order of the matrix
                                A.
          NO = 4.3 or 4.4     : IPAR(1) determines the dimension of
                                the second-order system, i.e., the
                                order of the stiffness matrix for
                                Examples 4.3 and 4.4 (parameter 'l'
       