Alford, M. G., K. Benson, S. R. Coleman, J. March-Russell, and F. Wilczek, "{Zero modes of nonabelian vortices}", Nucl.Phys., vol. B349, pp. 414-438, 1991.
The internet is an amazing source of information (and misinformation) about almost any topic. Here are a few URLs if you want to dig into elementary particles and unification.