1. Dietz K., Hadeler K.P., Epidemiological models for sexually transmitted diseases. J.Math.Biol. 26, 1?25 (1988)
2. Dowse H.B., Ringo J.M., Barton K.M., A model describing the kinetics of mating inDrosophila, J. Theor. Biol. 121, 173?183 (1986)
3. Hadeler, K.P., Waldst�tter, R., W�rz-Busekros, A., Models for pair formation. In: Conference Report, Deutsch-Franz�sisches Treffen �ber Evolutionsgleichungen, Blaubeuren, 3.?9. Mai 1987, Semesterbericht Funktionalanalysis T�bingen 1987, p.31?40.
4. Hadeler, K.P., Waldst�tter, R., W�rz-Busekros, A., Models for pair formation in bisexual populations. J.Math.Biol. submitted
5. Hirsch M.W., Systems of differential equations which are competitive or cooperative I. Limit sets. SIAM J.Math.Anal. 13, 167?179 (1982)