The ring galaxy HRG 54 103: a first studyM. Faúndez-Abans, I. F. Fernandes, M. de Oliveira-Abans, P. C. R. Poppe and V. A. F. MartinA&A, 507 3 (2009) 1303-1311DOI: https://doi.org/10.1051/0004-6361/200811045