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↑Böhme, S.; Esser, U.; Fricke, W.; Hefele, H.; Heinrich, I.; Hofmann, W.; Krahn, D.; Matas, V. R.; Schmadel, L. D.; Zech, G. (1985). "Literature, Part 2". Astronomy and Astrophysics Abstracts (in Engels). Springer Science & Business Media. 40: 871.