SEARCH Articles Figures Tables Douglas Douglas-Kroll Douglas-Kroll transformation (relativistic Douglas-Kroll transformations of higher order Douglas-Kroll-Hess Property Transformation Douglas-Kroll-Hess transformation Douglas-Kroll-Hess transformation relativistic effects Douglas-Kroll-Transformed Spin-Orbit Operators Douglas-Kroll-transformed Hamiltonian Extended Douglas-Kroll transformation Generalized Douglas-Kroll Transformation Implementation of the Douglas-Kroll Transformation Kroll Kroll Transformation The Douglas-Kroll Transformation The Douglas-Kroll-Hess transformation