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@article{MS2_1993__72_1_167245, author = {E. Poletaeva}, title = {Penrose's tensors. {II.}}, journal = {Mathematica Scandinavica}, pages = {191--211}, publisher = {mathdoc}, volume = {72}, number = {1}, year = {1993}, zbl = {0791.53036}, url = {http://geodesic.mathdoc.fr/item/MS2_1993__72_1_167245/} }
E. Poletaeva. Penrose's tensors. II.. Mathematica Scandinavica, Tome 72 (1993) no. 1, pp. 191-211. http://geodesic.mathdoc.fr/item/MS2_1993__72_1_167245/