On almost geodesic mappings of the type $\pi_1$ of Riemannian spaces preserving a system $n$-orthogonal hypersurfaces.
(English).
In:
Slovák, Jan
and
Čadek, Martin (eds.):
Proceedings of the 18th Winter School "Geometry and Physics".
Circolo Matematico di Palermo, Palermo, 1999.
pp. 103-108