A survey of existing and proposed classical and quantum approaches to the photon mass G. Spavieri, J. Quintero, G. T. Gillies and M. Rodríguez Eur. Phys. J. D, 61 3 (2011) 531-550 Published online: 25 February 2011 DOI: 10.1140/epjd/e2011-10508-7