  We study the partition function of the model formulated with Wilson fermions
with only one species, both analytically and numerically. At strong coupling we
construct the solution for lattice size up to $8\times 8$, a polynomial in the
hopping parameter up to $O(\ka^{128})$. At $\be>0$ we evaluate the expectation
value of the fermion determinant for complex values of $\ka$. From the Lee-Yang
zeroes we find support for the existence of a line of phase transitions from
$(\be=0, \ka\simeq 0.38)$ up to $(\be=\infty, \ka=1/4)$.
