1. Bezrukavnikov, R. (1995): Koszul property and Frobenius splitting of Schubert Varieties, alg-geom/9502021.
2. Braverman, A. and Gaitsgory, D. (1994): Poincaré-Birkhoff-Witt theorem for quadratic algebras of Koszul type, hep-th/9411113.
3. Chari, V. and Pressley, A. (1994): A Guide to Quantum Groups, Cambridge University Press, 1994.
4. Delius, G. and Hüffmann, A. (1995): On quantum algebras and quantum root systems, q-alg/9506017.
5. Donin, J. and Gurevich, D. (1995): Quantum orbits of R-matrix type, Lett. Math. Phys. 35 (1995) 263–276.