Nicoletta Del Buono Luciano Lopez Tiziano Politi Computation of functions of Hamiltonian and skew-symmetric matrices. 1284-1297 2008 79 Mathematics and Computers in Simulation 4 http://dx.doi.org/10.1016/j.matcom.2008.03.011 db/journals/mcs/mcs79.html#BuonoLP08