German submarine U-31 (S181) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "German submarine U-31 (S181)" in English language version.

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1web.archive.org

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1^st place

1mtu-online.com

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1,677^th place

1,893^rd place

baw.de

vzb.baw.de

Holger Naaf: Die Brennstoffzelle auf U 212 A (PDF, German). Bundesanstalt für Wasserbau, Wehrtechnische Dienststelle für Schiffe und Marinewaffen Eckernförde, 23. September 2008.

dagbladet.no

"Dette er ubåtsjefens våte drøm - nyheter". Dagbladet.no. 2010-11-18. Retrieved 2011-12-27.

marine.de

"Uboote Klasse 212A". Retrieved 2013-08-19.
"Deutsche Marine TV-Interview" (in German). Retrieved 2007-04-17.

mtu-online.com

"MTU 16V 396 diesel engine". Archived from the original on 2006-12-06. Retrieved 2006-10-08.

web.archive.org

"MTU 16V 396 diesel engine". Archived from the original on 2006-12-06. Retrieved 2006-10-08.