@article{05708865, title = {The symmetrical }, journal = {SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]}, volume = {5}, year = {2009}, zbl = {1188.33014}, language = {en}, url = {http://dml.mathdoc.fr/item/05708865} }
Ghressi, Abdallah; Khériji, Lotfi. The symmetrical . SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only], Tome 5 (2009) . http://gdmltest.u-ga.fr/item/05708865/