  The generalized Levy-Leblond equation (GLL) is used to study the bound state
problem for a non-relativistic Fermi field in pseudoscalar external potentials.
Two spherically symmetrical external potentials, a pseudoscalar spherical well
of finite depth and a pseudoscalar Coulomb potential, are considered. It is
shown that the rest energy of the Fermi field affects non-trivially the bound
state spectrum. The existence of bound states, their number and energies all
depend on the value of the rest energy.
