@article{ELMA_1988__43_3_141423,
     author = {Graciela Silvia Birman},
     title = {On {L2} and {L3.}},
     journal = {Elemente der Mathematik},
     pages = {46--49},
     publisher = {mathdoc},
     volume = {43},
     number = {3},
     year = {1988},
     zbl = {0705.53006},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1988__43_3_141423/}
}