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References (5):

• Oldfield, Ronald G.. 2009. "Captive breeding observations support the validity of a recently described cichlid species in lake Apoyo, Nicaragua". Occasional Papers of the Museum of Zoology, University of Michigan. (n. 741), pp. 14 (crc01854).
• Oldfield, Ronald G.. 2009. "Growth patterns in Midas cichlids are not consistent with a hypothesis of socially controlled sex determination". Copeia. v. 2009 (n. 1), pp. 71-77 (crc02426) (abstract).
• Oldfield, Ronald G.. 2005. "Cichlid sex determination research at the University of Michigan". Buntbarsche Bulletin. (n. 229), pp. 14-23 (crc03352) (abstract).
• Oldfield, Ronald G.. 2005. "Genetic, abiotic and social influences on sex differentiation in cichlid fishes and the evolution of sequential hermaphroditism". Fish and fisheries. v. 6(n. 2), pp. 93-110 (crc02437) (abstract).
• Oldfield, Ronald G.. 2004. "Saltwater cichlids. Knowledge of salinity tolerance and preference may allow new species combinations and improved husbandry in aquaria.". Freshwater and Marine Aquarium. v.27(8): pp.98-104. (crc02587).