  The Bethe-Salpeter amplitudes of the bound states formed by two scalar
particles with unequal masses are analyzed in the massive scalar particle
exchange ladder model. The norms of the amplitudes are calculated numerically,
and it is confirmed that the norm vanishes for the bound state corresponding to
the complex eigenvalue of the coupling constant. The behaviour of the
Bethe-Salpeter amplitudes in the momentum space is also investigated.
