This special number of the BULAG contains 9 research papers of special merit written by students of the 4th intake (2011) of the European Erasmus Mundus Masters Course International Masters in Natural Language Processing and Human Language Technology. The papers have been written as a requirement of the students' research projects which they presented at the 4th International Workshop on Natural Language Processing and Human Language Technology, Universidade do Algarve, Faro, June 20-21, 2013. Research themes: mathematical formalisation (1 paper); text applications (3 papers): optical character recognition, definition extraction, opinion mining; machine translation (5 papers): textual entailment across languages, noun phrases in technical corpora, syntactic simplification, collocation retrieval, film subtitles. Languages studied: Chinese, English, French, German, Italian, Khmer, Korean, Romanian and Spanish