↑(en) Maria João Romão et Robert Huber, « Structure and function of the xanthine-oxidase family of molybdenum enzymes », Metal Sites in Proteins and Models Redox Centres, vol. 90, , p. 69-95 (DOI10.1007/3-540-62888-6_3, lire en ligne)
↑(en) João M. Dias, Manuel E. Than, Andreas Humm, Robert Huber, Gleb P. Bourenkov, Hans D. Bartunik, Sergey Bursakov, Juan Calvete, Jorge Caldeira, Carla Carneiro, José J. G. Moura, Isabel Moura et Maria J. Romão, « Crystal structure of the first dissimilatory nitrate reductase at 1.9 Å solved by MAD methods », Structure, vol. 7, no 1, , p. 65-79 (PMID10368307, DOI10.1016/S0969-2126(99)80010-0, lire en ligne)