@article{GDZPPN00208189X, title = {On L2 and L3.}, journal = {Elemente der Mathematik}, volume = {43}, year = {1988}, pages = {46-49}, zbl = {0705.53006}, url = {http://dml.mathdoc.fr/item/GDZPPN00208189X} }
Birman, Graciela Silvia. On L2 and L3.. Elemente der Mathematik, Tome 43 (1988) pp. 46-49. http://gdmltest.u-ga.fr/item/GDZPPN00208189X/