1. Ar, A., Rahn, H.: Interdependence of gas conductance, incubation length, and weight of the avian egg. In: Piiper, J. (ed.). Respiration function in birds. Springer: Berlin Heidelberg New York 1978
2. Beverton, R. J. H., Holt, S. J.: On the dynamics of exploited fish populations. Fish Invest. Lond. Ser 2, 19 (1957)
3. Brody, S.: Bioenergetics and growth. Rheinhold New York 1945
4. Calder, W. A. I. I. I.: The kiwi and egg design: Evolution as a package deal. Bio Science 29, 461?467 (1979)
5. Diekmann, O., Metz, J. A. J. (eds.): The dynamics of physiologically structured populations. Lect. Notes Biomathem. Springer: Berlin Heidelberg New York Tokyo to appear (1984)