NGC 6638 (German Wikipedia)

Analysis of information sources in references of the Wikipedia article "NGC 6638" in German language version.

refsWebsite

Global rank German rank

887^th place

744^th place

5,388^th place

1,327^th place

1books.google.com

3^rd place

67^th place

low place

4,622^nd place

books.google.com

Steve O’Meara: Herschel 400 Observing Guide. Cambridge University Press, 2007, ISBN 978-0-521-85893-9, S. 234– (google.com).

caltech.edu

nedipac.caltech.edu

NASA/IPAC EXTRAGALACTIC DATABASE

cseligman.com

Seligman

seds.org

spider.seds.org

SEDS: NGC 6638