Berz, MartinErdélyi, Béla2004-12-032004-12-0320012001http://hdl.handle.net/2003/101010.17877/DE290R-10873enThe American Physical SocietyPhysical Review Letters530Optimal Symplectic Approximation of Hamiltonian Flows10.1103/PhysRevLett.87.114302article (journal)