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Balogh, Zoltán M; Calogero, Andrea (2021). Infinite geodesics of sub-Finsler distances in Heisenberg groups. International Mathematics Research Notices, 2021(7), pp. 4805-4837. Oxford University Press 10.1093/imrn/rnz074
Balogh, Zoltan; Calogero, Andrea; Kristaly, Alexandru (2015). Sharp comparison and maximum principles via horizontal normal mapping in the Heisenberg group. Journal of functional analysis, 269(9), pp. 2669-2708. Elsevier 10.1016/j.jfa.2015.08.014