Geodesic
Intertwining operators and Hirota bilinear equations
Teoretičeskaâ i matematičeskaâ fizika, Tome 104 (1995) no. 1, pp. 144-157

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We give an interpretation of Hirota relations for $\tau$-functions of hierarchies of integrable equations in terms of intertwining operators. This gives possibility to generalize the relations to the case of finite-dimensional Lie algebras and quantized universal enveloping algebras. An example of $U_q(sl_2)$ is presented. 
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     title = {Intertwining operators and {Hirota} bilinear equations},
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S. M. Kharchev; S. M. Khoroshkin; D. R. Lebedev. Intertwining operators and Hirota bilinear equations. Teoretičeskaâ i matematičeskaâ fizika, Tome 104 (1995) no. 1, pp. 144-157. http://geodesic.mathdoc.fr/item/TMF_1995_104_1_a10/