@article{05241627,
title = {Some sharp },
journal = {SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]},
volume = {3},
year = {2007},
zbl = {1141.15026},
language = {en},
url = {http://dml.mathdoc.fr/item/05241627}
}
Balinsky, Alexander; Ryan, John. Some sharp . SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only], Tome 3 (2007) . http://gdmltest.u-ga.fr/item/05241627/