Gangl, Herbert Max Planck Institute for Mathematics, Max Planck Society;
Gangl_perfect forms_oa_2013.pdf (Any fulltext), 161KB
Elbaz-Vincent, P., Gangl, H., & Soulé, C. (2013). Perfect forms, K-theory and the cohomology of modular groups. Advances in Mathematics, 245, 587-624. doi:10.1016/j.aim.2013.06.014.