   0  )
              (  11      )            (  11      )
     X' A Y = (          ),  X' B Y = (          ),
              ( 0    A   )            ( 0    B   )
              (       22 )            (       22 )

  and the elements of V and W do not exceed the value PMAX in
  magnitude. An adaptation of the standard method for solving
  generalized Sylvester equations [1], which controls the magnitude
  of the individual elements of the computed solution [2], is used
  to obtain V and W. When this attempt 