Fibre spaces of abelian surfaces over curves = Vezelruimten van abelse oppervlakken over krommen / door Reinier Jacobus Johannes AerdtsInvariant ideals of multiplicity free algebraic group actions / Gijsbertus Cornelis Michaël RuitenburgComplete subvarieties of moduli spaces of algebraic curves / Christiaan Gerrit ZaalComplete subvarieties of moduli spaces of algebraic curves / Christiaan Gerrit Zaal