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2. M. P. F. du Sautoy,Counting finite p-groups and nilpotent groups, preprint, to appear in Publications Mathématiques de l’IHES.
3. M. P. F. du Sautoy,Counting subgroups in nilpotent groups and points on elliptic curves, M.P.I. preprint series 2000 (86)
4. M. P. F. du Sautoy and F. J. Grunewald,Analytic properties of Euler products of Igusa-type zeta functions and subgroup growth of nilpotent groups, Comptes Rendus de l’Académie des Sciences, Paris, Série I329 (1999), 351–356.
5. M. P. F. du Sautoy and F. J. Grunewald,Analytic properties of zeta functions and subgroup growth, M.P.I. preprint series 1999 (87); to appear in the Annals of Mathematics.