@article{701727,
title = {On three-dimensional hypersurfaces with type number two in $\mathbb {H}^4$ and $\mathbb {S}^4$ treated in intrinsic way},
booktitle = {Proceedings of the 23rd Winter School "Geometry and Physics"},
series = {GDML\_Books},
publisher = {Circolo Matematico di Palermo},
address = {Palermo},
year = {2004},
pages = {[107]-126},
mrnumber = {MR2069399},
zbl = {1057.53044},
url = {http://dml.mathdoc.fr/item/701727}
}
Hájková, V.; Kowalski, O.; Sekizawa, M. On three-dimensional hypersurfaces with type number two in $\mathbb {H}^4$ and $\mathbb {S}^4$ treated in intrinsic way, dans Proceedings of the 23rd Winter School "Geometry and Physics", GDML_Books, (2004), pp. [107]-126. http://gdmltest.u-ga.fr/item/701727/