Please view an article about factors affecting distribution of Short-toed Eagle in south-eastern Spain /map/ (source – Annales Zoologici Fennici Journal):
• G. Moreno-Rueda, M. Pizarro, 2007 – Snake species richness and shrubland correlate with the short-toed eagle (Circaetus gallicus) distribution in south-eastern Spain // Ann. Zool. Fennici 44: in press. – 
(En)
Let us draw your attention to a work of Dimitris E. Bakaloudis, Christos G. Vlachos and Graham J. Holloway on Short-toed Eagle in northeast Greece /map/:
• D.E. Bakaloudis, C.G. Vlachos, G.J. Holloway, 2005 – Nest spacing and breeding performance in Short-toed Eagle Circaetus gallicus in northeast Greece // British Trust for Ornithology, Bird Study, 52: 330–338. – (En).
This text can be found in the Publications Archive of the University of Reading website.
If you are interested in some documents on Short-toed Eagles in Russian you should visit a website of the Working Group on Raptors of Northern Eurasia. We have told about this resource several times. The main subsection of the site is free electronic texts database, where you can raise a query for Circaetus and get the result as a list of texts dedicated to the species and also of texts with mentions of it (Ru)(En). There are 35 documents on Short-toed Eagle in all at the moment.
We have transformed some articles from the Sunbird.it (see the post Guido Premuda’s works) into the form, that is suitable for the machine translation:
• 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)
• 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)
• 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)
• 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)
Here you can acquaint yourself with the work on the wintering of Short-toed Eagle and Booted Eagle in Spain:
• José Enrique Martínes y José Antonio Sánchez-Zapata, 1999 – Invernada de Aguililla Calzada (Hieraaetus pennatus) y Culebrera Europea (Circaetus gallicus) en España // Ardeola 46(1): 93-96 – (Es)
(source – Ardeola website).
…and with abstract of the article about the Greek Short-toed Eagles:
• 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/
(source – the JSTOR database).
Articles of Bernd-Ulrich and Christiane Meyburgs dedicated to the satellite telemetry of migrating Short-toed Eagles (source – website of Bernd-U. and Christiane Meyburg – Raptor Research):
• Meyburg, B.-U., & C. Meyburg, 1999 – NASA-Satelliten im Dienste der Vogelforschung: Mit dem Schlangenadler nach Westafrika // Der Falke, 46: 164-177. – (De).
• Bernd-U. Meyburg, Christiane Meyburg & Jean-Claude Barbraud, 1998 – Migration strategies of an adult Short-toed Eagle tracked by satellite // Alauda, 66 (1): 39-48. – (En).
See the photo located on the Birdlife Belarus website and some links to V. Ivanovski‘s works concerning Short-toed Eagle ecology in Nothern Belarus /map/ (all contain summaries in English):
• В. Ивановский, 1992 – Экология гнездования змееяда в Белорусском Поозерье // Современная орнитология: 56-69. – (Ru) (translatable form)
(source – website of the Working Group on Raptors of Northern Eurasia).
• В. Ивановский, 2002 – Змееяд в Северной Беларуси: настоящее и будущее // Беркут, 11 (2): 158-164. – (Ru) (translatable form)
(source – website of the Ukrainian journal of ornithology BERKUT). The summary of this work can be found on the World Working Group on Birds of Prey and Owls website: The Short-toed Eagle Circaetus gallicus in Belarus (En) – sixth article. At the same time mark the first article on the list also, that is an abstract of the oral report of another researcher: Dimitris E. Bakaloudis – Aspects of the Ecology of the Short-toed Eagle Circaetus gallicus in Dadia Soufli Forest, NE Greece (En) /map/.
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 manual 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).