There is a book, originally published in German, Traditional bogenbauer by jurgen junkmens and a host of other European authors. It is also now available in English but I can't think of the exact title off hand.
It details originals and replicas of viking bows, including the Balinderry Longbow. They are similar to the Englishlb, full circle of arc tiller and made from yew, look to be quite powerful, but don't have horn nocks.
They have unusual tips that look to be steam bent like recurves, but in reverse, ie towards the belly/archer. The nocks are a couple of inches below the tips, where the bend starts, and are only single grooved. The area is wrapped with sinew or string to prevent splitting.
Hamish.