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Helfrich, K., Natural spin orbital analysis of diatomic molecular wave functions in terms of generalized diatomic orbitals. III. Variable screening models for some excited states of HeH⁺, Theor. Chim. Acta, 1979, 52, 163-170. [all data]

Ackermann, J.; Helfrich, K., Simultaneous ab initio calculations of isoelectronic diatomic molecules, Z. Phys. D: At. Mol. Clusters, 1991, 18, 365-372. [all data]