J. Chen, Duan, R., Ji, Z., Ying, M., and Yu, J.,
“Existence of Universal Entangler”,
Journal of Mathematical Physics, vol. 49, no. 1, p. 012103, 2008.
G. Alagic and Russell, A.,
“Uncertainty principles for compact groups”,
Illinois J. Math. , vol. 52, no. 4, pp. 1315-1324, 2008.