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Author: Hansen, W.

• Hansen, W.; Hueber, H.: The Dirichlet problem for sublaplacians on nilpotent Lie groups - geometric criteria for regularity. (English). In: Kurzweil, Jaroslav (ed.): Equadiff 7. Proceedings of the 7th Czechoslovak Conference on Differential Equations and Their Applications held in Prague, 1989. BSB B.G. Teubner Verlagsgesellschaft, Leipzig, 1990. pp. 171-174
• Hansen, W.: The Dirichlet problem. (English). In: Fábera, Jiří (ed.): Equadiff IV. Czechoslovak Conference on Differential Equations and Their Applications. Proceedings, Prague, August 22-26, 1977. Springer-Verlag, Berlin, 1979. pp. [139]-144