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Stegmann, H. B. and Dao-Ba, Hoang and Mäurer, M. and Buchner, Hans and Hartmann, Erwin and Mannschreck, Albrecht (1988) ESR and ENDOR investigations of phenanthrenesemiquinones. Magnetic Resonance in Chemistry 26 (7), pp. 547-551.
Mannschreck, Albrecht and Hartmann, Erwin and Buchner, Hans and Andert, Doris (1987) Twisted 9, 10-phenanthrenequinones: Chromatographic enrichment of enantiomers and barriers to racemization. Tetrahedron Letters 28 (30), pp. 3479-3482.