If you are looking for publications on the history of Belgium, then you will be pleased to know that the Bibliographie de l’Histoire de Belgique (BHB), indexing books, articles, and journals from 2009, is now available via SOLO and Databases A-Z+.
The free online bibliography allows you to search for authors, titles and keywords. There is also a keyword browse option.
For publications published between 1952 and 2008 check out the BHB pdf files at http://www.rbph-btfg.be/fr_biblio.html.
As ever, a bibliographical database only tells you what exists and not whether it is held in Oxford. You will need to search SOLO after you have found something of interest in the BHB.