@article{SLC_2009-2010_62_a4,
     author = {G\'erard H. E. Duchamp and Christophe Tollu and Karol A. Penson and Gleb A. Koshevoy},
     title = {Deformations of {Algebras:} {Twisting} and {Perturbations}},
     journal = {S\'eminaire lotharingien de combinatoire},
     year = {2009-2010},
     volume = {62},
     url = {http://geodesic.mathdoc.fr/item/SLC_2009-2010_62_a4/}
}