Based both on material reception conditions and dysfunctions of the application process, Amnesty International calls on the EU to ban transfers of asylum seekers to Bulgaria:

http://www.amnesty.fr/AI-en-action/Personnes-deracinees/Droit-dasile/Actualites/Pas-de-transfert-de-demandeurs-asile-en-Bulgarie-jusqu-nouvel-ordre-11323

The report (in English) published by Amnesty International following a visit to the country in March can be downloaded from:

http://www.amnesty.org/en/library/asset/EUR15/002/2014/en/7a706247-94ac-4e65-a2e5-c7f8804c02bd/eur150022014en.pdf