@article{05208235, title = {Brackets and curvature. (Corchete y curvatura.)}, journal = {Revista Colombiana de Matem\'aticas}, volume = {39}, year = {2005}, pages = {113-131}, zbl = {1144.53026}, language = {en}, url = {http://dml.mathdoc.fr/item/05208235} }
Di Scala, Antonio J. Brackets and curvature. (Corchete y curvatura.). Revista Colombiana de Matemáticas, Tome 39 (2005) pp. 113-131. http://gdmltest.u-ga.fr/item/05208235/