This old paper, dedicated to study of Short-toed Eagle diet in the Capanne di Marcarolo Natural Regional Park /map/ at the end of XX century, is available on the Carmagnola Natural History Museum site:
• Massimo CAMPORA, Silvia ALBERTI, 1997 – Osservazioni sulla dieta del biancone (Circaetus gallicus) in un’area dell’Appennino settentrionale [Observations on Short-toed Eagle diet in Northern Appennines (Italy, NW)] // Rivista Piemontese di Storia Naturale, 18: 233-239. – 
(It).
Currently, you can find online full texts of these two articles published in scientific journals in 2004 and 2005. The papers have already been mentioned on our site before:
• Paola SACCHI, Dominga SOGLIA, Sandra MAIONE, Giuseppe MENEGUZ, Massimo CAMPORA, Roberto RASERO, 2004 – A non-invasive test for sex identification in Short-toed Eagle (Circaetus gallicus) // Molecular & Cellular Probes, 18 (3): pp. 193-196. – (En).
• Massimo CAMPORA, Guido CATTANEO, 2005 – Ageing and sexing Short-toed Eagles // British Birds, 98: pp. 370-376. – (En).
A lot of information about observations and data on the current state of Short-toed Eagle population in the Isère Department /map/ are available on the LPO Mission rapaces and Faune Isère sites. Foremost, the following article by Françoise Chevalier deserves a particular attention:
• Françoise CHEVALIER, 2014 – Quatorze ans de recherche et de suivi des couples de circaète Jean-le-Blanc Circaetus gallicus dans le sud-est du département de l’Isère [Fourteen years of research and monitoring of Short-toed Eagle in the southeast of the Isère Department] // Le Bièvre, tome 26: pp. 26-33. – (Fr).
Also, please refer to the latest annual review:
• Françoise CHEVALIER, 2015 – Circaète Jean-le-Blanc Circaetus gallicus. Etude et suivis en Isère (38). Bilan 2015 [Short-toed Eagle. Research and monitoring in Isère. Summary for 2015] : 4 p. – (Fr).
A report for 2010 on Short-toed Eagle in the Isère Department /map/ can be found on the www.faune-isere.org:
• Françoise Chevalier, 2010 – Etude du Circaète Jean-le-Blanc Circaetus gallicus en Isère. Bilan 2010 [Research of the Short-toed Eagle in Isère. Summary for 2010] : 5 p. – (Fr).
It also contains data on the breeding success for period of 2005-2010.
This is just selection of links on miscellaneous texts and abstracts of articles about Short-toed Eagles. So…
Some abstracts can be found on the NCBI website with PubMed database:
• Sacchi P, Soglia D, Maione S, Meneguz G, Campora M, Rasero R, 2004 – A non-invasive test for sex identification in short-toed Eagle (Circaetus gallicus) // Mol Cell Probes, Jun 18 (3): 193-6. (En).
• Martin GR, Katzir G, 1999 – Visual fields in Short-toed Eagles, Circaetus gallicus (Accipitridae), and the function of binocularity in birds // Brain Behav Evol, 53 (2): 55-66. (En).
The encyclopedic compilation of information (Es) among other things has extensive ornithological bibliography concerning researching of Short-toed Eagle. The source is a site of the Enciclopedia Virtual de los Vertebrados Españoles.