Sundberg U. Swedish defensive fortress warfare in the Great Northern War 1702-1710

A new dissertaion "Swedish defensive fortress warfare in the Great Northern War 1702-1710" by Ulf Sundberg was published this year in Abo (Finland). I find it interesting, but disputable. My main concern is about limited use of the Russian sources. You may find the full text here (link)

Short remarks on Sunderg's work you may find in Bengt Nilsson's blog (link)