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Seymour, Robert and Sozou, Peter D. (2009) Duration of courtship effort as a costly signal. Journal of Theoretical Biology (256). pp. 1-13. ISSN 0022-5193
Sozou, Peter D. and Seymour, Robert (2005) Costly but worthless gifts facilitate courtship. Proceedings of the Royal Society B: Biological Sciences, 272 (1575). pp. 1877-1884. ISSN 0962-8452
