  The Anderson metal-insulator transition is a continuous phase transition
driven by disorder. It remains a challenging problem to theoretically determine
universal critical properties at the transition. The Anderson transition in a
model with a discrete sublattice or particle-hole symmetry belongs to one of
seven universality classes which are different from the three well-known
standard ones. Here we review our recent theoretical work on these new
universality classes in (quasi) one and two dimensions.
