R.  Savolainen and Deslippe, R. J., ?Facultative and obligate slavery in formicine ants: frequency of slavery and proportion of slaves. ?, Biol. J. Linnean Soc., vol. 57, pp. 47-58, 1996.

R. J.  Deslippe and Savolainen, R., ?Sex investment in a social insect: the proximate role of food.?, Ecology, vol. 76, pp. 375-382, 1995.

R. J.  Deslippe and Savolainen, R., ?Role of food supply in structuring a population of Formica ants.?, Journal of Animal Ecology , vol. 63, pp.  756-764, 1994.