The Nulling Coronograph Guyon, O. ; Roddier, C. ; Elon Graves, J. ; Roddier, F. ; Cuevas, S. ; Espejo, C. ; Martinez, A. ; Gonzales, S. ; Bisiacchi, G. ; Vuntersmeri, V. Abstract Publication: European Southern Observatory Conference and Workshop Proceedings Pub Date: 1999 Bibcode: 1999ESOC...56..537G