On 4-planar mapping of special almost antiquaternionic spaces Bělohlávková, Jana; Mikeš, Josef; Pokorná, Olga — 2001 Proceedings of the 20th Winter School "Geometry and Physics"
4-planar mappings of almost quaternionic and almost antiquaternionic Spaces. Bĕlohlávková, Jana; Mikes̆ Joseph; Pokorna, Olga — 1997 General Mathematics