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Balogh, Zoltan; Ferrari, Fausto; Franchi, Bruno; Vecchi, Eugenio; Wildrick, Kevin Michael (2015). Steiner’s formula in the Heisenberg group. Nonlinear analysis: theory, methods & applications, 126, pp. 201-217. Elsevier 10.1016/j.na.2015.05.006
