G. Hammarhjelm, A. Strömbergsson, S. Yu,
Asymptotic estimates of large gaps between directions in certain planar quasicrystals,
Journal of the London Mathematical Society, 111 (2025), 1-55, doi: http://dx.doi.org/10.1112/jlms.70187
A. Strömbergsson,
On the deviation of ergodic averages for horocycle flows
preprint, 2003; see paper published in Journal of Modern Dynamics, 7 (2013), 291-328.