Papers
https://books.google.com/books?hl=en&lr=&id=HY8kBAAAQBAJ&oi=fnd&pg=PA1&dq=pultrusion&ots=jKMgInIauC&sig=bhZebDu0cFhfZ3IxkH2LMnoE-ig
https://patents.google.com/patent/US5084222A/en