1. Alexander RD, Sherman PW (1977) Local mate competition and parental investment in social insects. Science 196:494–500
2. Anderson M (1984) The evolution of eusociality. Annu Rev Ecol Syst 15:165–189
3. Bernard F (1968) Les Fourmis d’Europe occidentale et septentrionale. Faune Eur Bass Med 3: 1–411
4. Boomsma JJ (1987) The empirical analysis of sex allocation in monogynous ants. In: Eder J, Rembold H (eds) Chemistry and biology of social insects. Proc 10th Int Congr IUSSI, München, pp 355–357
5. Boomsma JJ (submitted) Sex investment ratios in ants: has female bias been systematically overestimated?