Two articles are available in the Bibliography section of Guido Premuda‘s website Sunbird.it:
• PREMUDA G., 2010 – Trends at a roost of Short-toed Eagles Circaetus gallicus over ten years // Avocetta 34: 63-64. – 
(En).
• PREMUDA G., BAGHINO L., GUSTIN M. & BORIONI M., 2010 – Data on spring migration of immature Short-toed Eagles Circaetus gallicus through the Central Mediterranean route (Italy, Tunisia) // Avocetta 34: 65-68. – (En).
The Wiley InterScience website database allows to find full texts or abstracts of articles dedicated to Short-toed Eagle. Here are two of 12 articles from the actual search results:
• D.E. BAKALOUDIS, C.G. VLACHOS, G.J. HOLLOWAY, 1998 – Habitat use by Short-toed Eagles Circaetus gallicus and their reptilian prey during the breeding season in Dadia Forest (north-eastern Greece) // Journal of Applied Ecology, Vol. 35, No. 6: 821-828. – (En) /map/ – the abstract was mentioned before.
• ANTONIO-ROMÁN MUÑOZ, BERT TOXOPEUS, JAVIER ELORRIAGA, JUAN-MIGUEL GONZALEZ, BEATRIZ YÁÑEZ, 2010 – First record of a communal roost of Short-toed Eagles Circaetus gallicus // Ibis, Vol. 152, No. 1: 173-175. – (En).
Please read the text written by Guido Premuda together with Andrea Corso dedicated to determination of Short-toed Eagle’s age and sex by plumage characters: Il piumaggio del Biancone: età, sesso e morfismo (It) which could be used as a hand book for the field work.
Also the photo and a list of full texts of Premuda’s articles dedicated to Short-toed Eagle can be found here (the source is his own website – Sunbird.it):
• PREMUDA G., 2004 – Prime osservazioni della migrazione primaverile “a circuito” del Biancone, Circaetus gallicus, nelle Alpi Apuane // Rivista Italiana di Ornitologia, 74 (2): 119-124. – (It).
• PREMUDA G., 2004 – Osservazione di un dormitorio di Biancone, Circaetus gallicus, e considerazioni sul piumaggio degli immaturi // Rivista Italiana di Ornitologia, 74(1): 76-80. – (It) (translatable form).
• PREMUDA G., 2004 – La migrazione del Biancone Circaetus gallicus in Italia: stato delle conoscenze attuali. In: Atti del Convegno “Rapaci in volo verso l’Appennino” // Corpo Forestale dello Stato – Gestione ex ASFD di Lucca – Riserva Naturale Statale dell’Orecchiella, 21-24. – (It) (translatable form).
• AGOSTINI N., BAGHINO L., PANUCCIO M., PREMUDA G. & PROVENZA A., 2004 – The autumn migration strategies of adult and juvenile short-toed eagles Circaetus gallicus in the central Mediterranean // Avocetta, 28: 25-28. – (En).
• PREMUDA G., 2002 – Primi dati sulla migrazione post-riproduttiva del Biancone, Circaetus gallicus, nelle Alpi Apuane // Rivista Italiana di Ornitologia, 71(2): 181-186. – (It) (translatable form).
• AGOSTINI N., BAGHINO L., COLEIRO C., CORBI F. & PREMUDA G., 2002 – Circuitous autumn migration in Short-toed Eagle Circaetus gallicus // Journal of Raptor Research., 36(2): 111-114. – (En) (translatable form).
• AGOSTINI N., BAGHINO L., PANUCCIO, M. & PREMUDA G., 2002 – A conservative strategy in migrating Short-toed Eagles Circaetus gallicus // Ardeola, 49(2): 287-291. – (En).