SEARCH Articles Figures Tables Douglas Douglas-Kroll Douglas-Kroll-Hess AIMP molecular Hamiltonian Douglas-Kroll-Hess Hamiltonian Douglas-Kroll-Hess Hamiltonian/method Douglas-Kroll-Hess Hamiltonians Douglas-Kroll-transformed Hamiltonian Hamiltonian Douglas-Kroll, second-order Kroll Relativistic computations, Douglas-Kroll Hamiltonians Two-component Douglas-Kroll Hamiltonians