1. Proc. XX Intern. Symp. on the Theory of elementary particles;Bennett,1986
2. Proc. XX Intern. Symp. on the Theory of elementary particles;Bennett,1986
3. An inequality relating gauge group coupling constants and the number of generations in a string inspired model;Nielsen,1987
4. Proc. XX Intern. Symp. on the Theory of elementary particles;Bennett,1987
5. H.B. Nielsen and S. Chadha, unpublished.