1. Sperm morphological diversity;Pitnick,2009
2. Sperm in competition: not playing by the numbers;Snook;Trends Ecol. Evol.,2005
3. Sperm competition and sperm phenotype;Pizzari,2009
4. Sexual selection and the evolution of sperm quality;Fitzpatrick;MHR,2014
5. Sperm wars and the evolution of male fertility;Simmons;Reproduction,2012