Geodesic
Fusion of $q$-tensor operators: quasi-Hopf-algebraic point of view
Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 14, Tome 245 (1997), pp. 107-129

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We discuss the fusion of tensor operators for $U_q(\mathscr J)$ by means of the $R$-matrix approach. The problem is reduced to construction of the twisting element $\mathscr J$ which appears in Drinfeld's description of quasi-Hopf algebras. The discussion is illustrated by explicit calculations for the case of $U_q(sl(2))$. 
@article{ZNSL_1997_245_a5,
     author = {A. G. Bytsko},
     title = {Fusion of $q$-tensor operators: {quasi-Hopf-algebraic} point of view},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {107--129},
     publisher = {mathdoc},
     volume = {245},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1997_245_a5/}
}
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A. G. Bytsko. Fusion of $q$-tensor operators: quasi-Hopf-algebraic point of view. Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 14, Tome 245 (1997), pp. 107-129. http://geodesic.mathdoc.fr/item/ZNSL_1997_245_a5/