Nice history of European frigate design with special attention to the Danish Navy. Many useful illustrations and lines plans.
The link is https://www.academia.edu/906945/Fregat_and_snau_small_cruisers_in_the_Danish_navy_1650_1750
The link is https://www.academia.edu/906945/Fregat_and_snau_small_cruisers_in_the_Danish_navy_1650_1750