MEDRAPTORS – Mediterranean Raptor Migration Network. There is a list of different publications on the site with a new one on migrating Short-toed Eagles. Nicolantonio Agostini, Ugo Mellone, Michele Panuccio, Giuseppe Lucia, Marco Gustin are its co-authors:
• Agostini N., Panuccio M., Lucia G., Liuzzi C., Amato P., Provenza A., Gustin M. & Mellone U., 2009 – Evidence for age-dependent migration strategies in the Short-toed Eagle // British Birds 102(9): 506-508. – 
(En).
Let us draw your attention to a website of the Scientific Electronic Library – eLibrary.ru. You can get actually every publication of the Russian Ornithological Journal after free registration on the site. Some of them are dedicated to Short-toed Eagle (Ru):
• Ивановский В.В., 1983 – Змееяд Circaetus gallicus в Белорусском Поозерье [Short-toed Eagle in Belarussian Poozer’e] // Тез. докл. 11-й Прибалт. орнитол. конф. Таллин: 95-98 – Рус. орнитол. журн. 2007. Том 16. Экспресс-выпуск № 389: 1594-1596. /map/.
• Гуль В.Н., 2000 – Новая находка змееяда Circaetus gallicus в Себежском Поозерье (Псковская область) [New find of Short-toed Eagle in Sebezh Poozer’e (Pskov Region)] // Рус. орнитол. журн. Экспресс-выпуск 110: 9-10. /map/.
• Березовиков Н.Н., Левин А.С., 2002 – О нахождении смешанной кладки змееяда Circaetus gallicus и степной пустельги Falco naumanni в Прибалхашье [Find of mixed clutch of Short-toed Eagle and Lesser Kestrel in Pribalkhashie] // Рус. орнитол. журн. Экспресс-выпуск 201: 967. /map/.
• Agostini N., Mellone U., 2008 – Does migration flyway of Short-toed Eagles (Circaetus gallicus) breeding in Central Italy reflect the colonization history? // Journal of Raptor Research, 42(2): 158-159. – (En).
We extend our thanks to Ugo Mellone for pointing the article out. It can be found among other papers on the Research section of his website.
We would like to invite you to visit the website of Igor Karyakin: Russian Birds of Prey Researchers Club. General and some local /map/ information on Short-toed Eagle can be found there:
• Игорь Карякин, 1998 – Змееяд – Пернатые хищники Уральского региона. Соколообразные (Falconiformes) и Совообразные (Strigiformes). Пермь: Центр полевых исследований Союза охраны животных Урала / Социально-экологический союз: 180-189 – (Ru).
• Г.П. Дементьев, 1951 – Змееяд (Circaetus gallicus) – Птицы Советского Союза, т.1. – М.: Сов. наука – (Ru).
(the source is a subsection of the site: Publications)
One more general description (Ru) (composed, in this case, by Igor Karyakin) is located in the subsection titled Articles on Species.