Matias, P., V. Fulop, A. Thompson, A. Gonzalez, and MA Carrondo. "{Desulfoferrodoxin structure determined by MAD phasing and refinement to 1.9-angstrom resolution reveals a unique combination of a tetrahedral FeS4 centre with a square pyramidal FeSN4 centre}." J Biol Inorg Chem. 2 (1997): 680-689.