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• Biś, Andrzej: Geometrical directions and ends of a manifold, points of accumulation of a direction of a group in the hyperbolic space $H^2$. (English). In: Bureš, J. and Souček, V. (eds.): Proceedings of the Winter School "Geometry and Physics". Circolo Matematico di Palermo, Palermo, 1996. pp. [37]-56