This paper is the start of direct basis vector refinement where the refined variables are the mixing coefficients of the basis vectors calculated using representation theory, rather than atomic-level moment components.
A.S. Wills, Physica B 276-278, 680-681 (2000). https://doi.org/10.1016/S0921-4526(99)01722-6 Physica B 2000 Wills
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