Карл Фридрих Рап (Bulgarian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Карл Фридрих Рап" in Bulgarian language version.

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berlinsbi.com

German Entrepreneurs // 17 September 2018. Посетен на 11 October 2021.

books.google.com

Charles Wankel. Encyclopedia of Business in Today′s World. SAGE Publications, 12 June 2009. ISBN 978-1-5063-1952-0. с. 160.

doi.org

dx.doi.org

Sergio Cortesi et al.: Sunspot observations and counting at Specola Solare Ticinese in Locarno since 1957. In: Solar Physics, 2016, arXiv:1602.07998, DOI:10.1007/s11207-016-0872-7.