@article{701670,
     title = {On 4-planar mapping of special almost antiquaternionic spaces},
     booktitle = {Proceedings of the 20th Winter School "Geometry and Physics"},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {2001},
     pages = {97-103},
     mrnumber = {MR1826682},
     zbl = {1013.53022},
     url = {http://dml.mathdoc.fr/item/701670}
}

Bělohlávková, Jana; Mikeš, Josef; Pokorná, Olga. On 4-planar mapping of special almost antiquaternionic spaces, dans Proceedings of the 20th Winter School "Geometry and Physics", GDML_Books,  (2001), pp. 97-103. http://gdmltest.u-ga.fr/item/701670/