• 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.