Paare und Tripel halbkonzentrischer Kreise der euklidischen Ebene.
Planes with analogues to Euclidean angular bisectors.
Point-reflections in metric plane.
Polygonal chain sequences in the space of compact sets.
Poznámka o trojúhelnících racionálných
Products of simple isometries of given conjugacy types.
Proper holomorphic mappings and real reflection groups.
Proximinality in geodesic spaces.