Thioindigo (German Wikipedia)

Analysis of information sources in references of the Wikipedia article "Thioindigo" in German language version.

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Elmar Steingruber: Indigo and Indigo Colorants. In: Ullmann’s Encyclopedia of Industrial Chemistry. Wiley-VCH, Weinheim 2000, ISBN 978-3-527-30673-2, doi:10.1002/14356007.a14_149.pub2.
W. Haase-Wessel, M. Ohmasa, P. Süsse: Thioindigo: Crystal structural data for modification II. In: Naturwissenschaften. Band 64, Nr. 8, 1977, S. 435–435, doi:10.1007/BF00508700.

Patent EP0056867: Process for the preparation of 4,4'-7,7'-tetrachloro thioindigo. Veröffentlicht am 4. August 1982, Erfinder: Helmut Hoch, Heinrich Hiller.‌