  We investigate some properties of Karsten-Wilczek and Borici-Creutz fermions,
which are the best known varieties in the class of minimally doubled lattice
fermion actions. Our focus is on the dispersion relation and the distribution
of eigenvalues in the free-field theory. We consider the situation in two and
four space-time dimensions, and we discuss how properties vary as a function of
the Wilson-like lifting parameter $r$.
