57 Manifolds and cell complexes
57Sxx Topological transformation groups
57S30 Discontinuous groups of transformations (2 articles)
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Hajduk, Bogusław; Walczak, Rafał:
Invariant metrics on $G$-spaces.
(English).
Czechoslovak Mathematical Journal,
vol. 53
(2003),
issue 2,
pp. 449-466
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Hejný, Milan:
Klein Hyperbottle.
(English).
Matematický časopis,
vol. 25
(1975),
issue 4,
pp. 369-371