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4. S. L. Dexheimer, Joel W. Gohdes, Michael K. Chan, Karl S. Hagen, William H. Armstrong, and Melvin P. Klein, “Detection of EPR Spectra in S= 2 States of Trivalent Manganese Complexes.” J. Am. Chem. Soc. 1989, 111, 8923-8925.

3. Karl S. Hagen, T. David Westmoreland, Michael J. Scott, and William H. Armstrong, “Structural and Electronic Consequences of Protonation in {Mn₄O₆}⁴⁺ Cores: pH Dependent Properties of Oxo-Bridged Manganese Complexes.” J. Am. Chem. Soc. 1989, 111, 1907-1909.

2. Karl S. Hagen, William H. Armstrong, and Marilyn M. Olmsted, “[Mn₁₀O₁₄{N(CH₂CH₂NH₂)₃}₆]⁸⁺: A mixed-Valence Polyoxomanganese Polycation Possessing Structural Similarities to Naturally Occurring Layered Manganese Oxides.” J. Am. Chem. Soc. 1989, 111, 774-775.

1. Karl S. Hagen, William H. Armstrong, Håkon Hope, “Isolation of a Bis-Oxo-Bridged MnIIIMnIV Intermediate by Regulated Air Oxidation. Synthesis, Structure, and Properties of [Mn₂O₂(tren)₂](CF₃SO₃)₃.” Inorg. Chem. 1988, 27, 967-969.

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