The first
Luftwaffe night fighter squadron was established on the 19th of July 1940. Under
the command of a Josef
Kammhuber, to counter the RAF using a chain of radar stations from Norway
to the Swiss border to provide early warning of imminent attacks.
The Warplanes
of the Third Reich.
ISBN-10: 0385057822
German Aircraft of the Second
World War.
ISBN-10: 0370000242
Hitler's Luftwaffe.
ISBN-10: 051718771X
For a complete list of
sources 
