  | Cléry, F.* , & van der Geer, G.*. (In press). Generating Picard modular forms by invariant theory. Pure and Applied Mathematics Quarterly.  Peer reviewed* These authors have contributed equally to this work. |
 | van der Geer, G. (In press). Curves over finite fields and moduli spaces. In Curves over finite fields: past, present and future. France: SMF. Peer reviewed |
 | van der Geer, G. (In press). Siegel modular forms of degree two and three and invariant theory. In The art of doing algebraic geometry. Springer. Peer reviewed |
 | van der Geer, G.* , & Bergström, J.*. (2022). Picard modular forms and the cohomology of local systems on a Picard modular surface. Commentarii Mathematici Helvetici, 97, 305-381. doi:10.4171/CMH/532 Peer reviewed* These authors have contributed equally to this work. |
 | van der Geer, G.* , & Cléry, F.*. (2022). Modular forms of degree 2 and curves of genus 2 in characteristic 2. International Mathematics Research Notices. doi:10.1093/imrn/rnaa239 Peer Reviewed verified by ORBi* These authors have contributed equally to this work. |