White Tailed Eagle
Tuwit and Tom, I cannot help with the scientific literature, but the good news is that if you scroll up to Internetman's post at 10:20 pm on the 17th of November and click on the link there to the Roy Dennis Wildlife Foundation (one of the groups involved intimately in the translocation of the Eagles and of many other species around the UK and Europe) it will take you to the long article on that website about the translocation project of White-tailed Eagles to the Isle of Wight, and you will learn much more about the subject. Also, the article includes an e-mail address and a phone number with which to contact the Foundation. If you explain who you are and your interest in the subject, I expect they will be happy to direct you to the relevant scientific studies--the article refers to some studies but does not include specific references, presumably since that website is not specifically aimed at academics but is for everyone, from the least to the most well educated (or at least that is my impression--I could be wrong!) I expect that there are scientific articles accessible online--please come back and let us know how you get on and what you learn about the Eagles. I, and most likely others, would like to know more about the birds ourselves. Also, I expect that Pete (posting above as Seaman) can direct you to where he read about the Eagles in Poland.
Edit: tuwit, you might consider starting a new thread since your question is technically a different topic, and you might have responses from others who may not read this thread about the Eagles but who may be able to help with your specific interest.