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