Martin Beaudry José M. Fernandez Markus Holzer A common algebraic description for probabilistic and quantum computations<sup>, </sup>. 206-234 2005 345 Theor. Comput. Sci. 2-3 http://dx.doi.org/10.1016/j.tcs.2005.07.008 db/journals/tcs/tcs345.html#BeaudryFH05