Pulsed Optical Emission from PSR 0656+14 - Shearer, A; Redfern, RM; Gorman, G; Butler, R; Golden, A; O'Kane, P; Beskin, G; Neizvestny, SI; Neustroev, VV; Plokhotnichenko, VL; Cullum, M (Astrophysical Journal Letters, 1997)