Voir la notice de l'article provenant de la source Mathematicac Balkanica website
@article{MABA_1997_11_1-2_a6, author = {Raina Ivanova}, title = {An {Orthogonal} {Tangential} {Group} of {Transformations} of a {4-Dimensional} {Riemannian} {Manifold}}, journal = {Mathematica balkanica}, pages = {57}, publisher = {mathdoc}, volume = {11}, number = {1-2}, year = {1997}, url = {http://geodesic.mathdoc.fr/item/MABA_1997_11_1-2_a6/} }
Raina Ivanova. An Orthogonal Tangential Group of Transformations of a 4-Dimensional Riemannian Manifold. Mathematica balkanica, Tome 11 (1997) no. 1-2, p. 57. http://geodesic.mathdoc.fr/item/MABA_1997_11_1-2_a6/