  The upper critical field $H_{c2}(T)$ of the tight-binding electrons in the
three-dimensional lattice is investigated.
  The electrons make Cooper pairs between the eigenstates with the same energy
in the strong magnetic field. The transition lines in the quasi-one dimensional
case are shown to deviate from the previously obtained results where the
hopping matrix elements along the magnetic field are neglected. In the absence
of the Pauli pair breaking the transition temperature $T_c(H)$ of the quasi-two
dimensional electrons is obtained to oscillationally increase as the magnetic
field becomes large and reaches to $T_c(0)$ in the strong field as in the
quasi-one dimensional case.
