The effect of discretization on homoclinic orbits
In: Bifurcation: analysis, algorithms, applications: proceedings of the conference at the University of Dortmund, August 18 - 22, 1986, Jg. 79, S. 1-8
Effects of drought and mycorrhiza on wheat and aphid infestation
In: Ecology and Evolution, Jg. 10 H. 19, S. 10481-10491Explaining interviewer effects and respondent behavior: Theoretical models and empirical analysis
In: Quality and Quantity, Jg. 27 H. 3, S. 219-247