Which weakly ramified group actions admit a universal formal deformation?

Byszewski, Jakub; Cornelissen, Gunther

Annales de l'Institut Fourier, Volume 59 (2009) p. 877-902

Division-ample sets and the Diophantine problem for rings of integers

Cornelissen, Gunther; Pheidas, Thanases; Zahidi, Karim

Journal de théorie des nombres de Bordeaux, Volume 17 (2005) p. 727-735

Problems from the workshop on Automorphisms of Curves (Leiden, August, 2004)

Cornelissen, Gunther; Oort, Frans

Rendiconti del Seminario Matematico della Università di Padova, Volume 113 (2005) p. 129-177