@article{10_4153_CJM_1994_040_6,
     author = {Drensky, Vesselin and Giambruno, Antonio},
     title = {Cocharacters, {Codimensions} and {Hilbert} {Series} of the {Polynomial} {Identities} for 2 {\texttimes} 2 {Matrices} with {Involution}},
     journal = {Canadian journal of mathematics},
     pages = {718--733},
     year = {1994},
     volume = {46},
     number = {4},
     doi = {10.4153/CJM-1994-040-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1994-040-6/}
}