1. Un principe de permanence général;van den Berg;Astérisque,1983
2. Nonstandard Asymptotic Analysis;van den Berg,1987
3. On solutions of polynomial growth of ordinary differential equations;van den Berg;J. Differential Equations,1989
4. Exponential stability and the riverphenomenon;van den Berg;Res. Mem. Inst. of Ec. Groningen,1990
5. Macroscopes, regular variation and polynomial growth;van den Berg;Res. Mem. Inst. of Ec. Groningen,1990