After the first reports of the breeding of Short-toed Eagle in Switzerland, the successful attempt was observed in Central Valais /map/ in 2017:
• Raphaël ARLETTAZ, Stéphane METTAZ & Klaus AGTEN, 2018 – Première nidification réussie du Circaète Jean-le-Blanc Circaetus gallicus en Suisse romande [The first successful nesting of Short-toed Eagle in Romandy] // Nos Oiseaux 65/3, N° 533: pp. 175-179. – 
(Fr).
The article is available on the University of Bern website.
The article by Lionel Maumary and others contains the detailed description of the first ST Eagle breeding in Switzerland /map/ in 2012, observations of the breeding biology and the diet data particularly:
• Lionel MAUMARY, Hubert DUPERREX, Jacques CLOUTIER, Laurent VALLOTTON, 2013 – Première nidification du Circaète Jean-le-Blanc (Circaetus gallicus) en Suisse – Observations sur la biologie de reproduction, en particulier le régime alimentaire [The first nesting of Short-toed Snake Eagle in Switzerland – Observations of the reproductive biology, and the diet] // Nos Oiseaux, 60: pp. 3-24. (Fr) {rough translation}.
This year Short-toed Eagles’ breeding was observed in southwestern Switzerland /map/ for the first time. On the Oiseaux.ch website you can find the report on this written by Lionel Maumary:
• Lionel Maumary, 2012 – Le Circaète Jean-le-Blanc a niché en Suisse ! [Short-toed Eagle has bred in Switzerland] // Oiseaux.ch (Fr) {rough translation} – the text contains excellent pictures and video. Also photos of this pair of Short-toed Eagles taken by Thomas Nierle in April 2012 can be viewed here. The juvenile Eagle has left the nest succesfully!
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.