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Journal of Algebra > 2011 > 339 > 1 > 114-134
Czechoslovak Journal of Physics > 2006 > 56 > 4 > 329-339
Czechoslovak Journal of Physics > 2006 > 56 > 4 > 329-339
Letters in Mathematical Physics > 2000 > 52 > 4 > 263-275
Journal of Algebra > 2011 > 339 > 1 > 114-134
Czechoslovak Journal of Physics > 2006 > 56 > 4 > 329-339
Czechoslovak Journal of Physics > 2006 > 56 > 4 > 329-339
Letters in Mathematical Physics > 2000 > 52 > 4 > 263-275