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nih.gov
pubmed.ncbi.nlm.nih.gov
Christopher T. J. Nelson & Robert W. Elwood (1997). “Parental state and offspring recognition in the biparental cichlid fish Pelvicachromis pulcher”. Animal Behaviour54 (4): 803–809. doi:10.1006/anbe.1996.0507. PMID9344434.