1. A. Chakrabarti, “RTT relations, a modified braid equation and noncommutative planes,” J. Math. Phys. (unpublished), math.QA/0009178.
2. M. Gerstenhaber and A. Giaquinto, “Boundary solutions of the quantum Yang–Baxter equation and solutions in three dimensions,” q-alg/9710033.
3. B. L. Cerchiai, G. Fiore, and J. Madore, “Geometrical tools for quantum Euclidean spaces,” math.QA/0002007.