Ballmann, Werner Max Planck Institute for Mathematics, Max Planck Society;
https://doi.org/10.4310/jdg/1404912100 (Publisher version)
Ballmann_On eta-functions_oa_2014.pdf (Any fulltext), 256KB
Ballmann, W. (2014). On eta-functions for nilmanifolds. Journal of Differential Geometry, 97(1), 1-10. doi:10.4310/jdg/1404912100.