Geodesic
Quantum $R$ matrices and matrix generalizations of trigonometric functions
Teoretičeskaâ i matematičeskaâ fizika, Tome 73 (1987) no. 1, pp. 26-32

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Representations in the form of ratios of integer (quasi) periodic matrix functions are obtained for trigonometrical $R$-matrices related to classical Lie groups. Unitarity of $R$-matrices for these representations can be checked easily. 
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     author = {V. V. Bazhanov},
     title = {Quantum $R$ matrices and matrix generalizations of trigonometric functions},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {26--32},
     publisher = {mathdoc},
     volume = {73},
     number = {1},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1987_73_1_a2/}
}
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V. V. Bazhanov. Quantum $R$ matrices and matrix generalizations of trigonometric functions. Teoretičeskaâ i matematičeskaâ fizika, Tome 73 (1987) no. 1, pp. 26-32. http://geodesic.mathdoc.fr/item/TMF_1987_73_1_a2/