@article{01124660,
title = {The manifold of the unitary group over the dual numbers. (La vari\'et\'e du groupe unitaire dual.)},
journal = {Balkan Journal of Geometry and its Applications (BJGA)},
volume = {1},
year = {1996},
pages = {45-51},
zbl = {0895.53024},
language = {en},
url = {http://dml.mathdoc.fr/item/01124660}
}
Grecu, Eftimie. The manifold of the unitary group over the dual numbers. (La variété du groupe unitaire dual.). Balkan Journal of Geometry and its Applications (BJGA), Tome 1 (1996) pp. 45-51. http://gdmltest.u-ga.fr/item/01124660/