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Gilbert, L. E. (1972).  Pollen Feeding and Reproductive Biology of Heliconius Butterflies. Proceedings of the National Academy of Sciences USA. 69, 1403-1407.
Rouse, G. W., & Pleijel F. (2001).  Polychaetes. London: Oxford University Press.
Arnheim, N., & Erlich H. (1992).  Polymerase chain reaction strategy. Annual Review of Biochemistry. 61, 131-156.
[Anonymous] (1995).  Population Biology of the Florida Manatee. (O'SheaT J., AckermanB B., PercivalH F., Ed.).Bational Biological Service Information and Technology Report No. 1. Washington, D.C.: National Biological Service.