More secondary sources to look at (all in russian):
http://eismeerjager.livejournal.com
http://igor-ktb.livejournal.com
Mardanov got his book about year 1941 published:
Александр Марданов: 1941. Воздушная война в Заполярье.
ISBN 978-5-906716-44-6
discussion with author (seems that forum sometimes does not work):
http://www.sk16.ru/forum/viewtopic.php?f=23&t=1425
also there is small critique about this book by author of one blog above:
http://igor-ktb.livejournal.com/18903.html
http://igor-ktb.livejournal.com/19106.html