1. THE RECONSTRUCTION OF A CONTRACTED ABSTRACT SYNTAX TREE. Authors: RÓBERT KITLEI.2. MODELING SEMANTIC KNOWLEDGE IN ERLANG FOR REFACTORING. Authors: ZOLTÁN HORVÁTH, LÁSZLÓ LÖVEI, TAMÁS KOZSIK, RÓBERT KITLEI, ANIKÓ NAGYNÉ VÍG, TAMÁS NAGY, MELINDA TÓTH, ROLAND KIRÁLY.3. USING IMPACT ANALYSIS BASED KNOWLEDGE FOR VALIDATING REFACTORING STEPS. Authors: ZOLTÁN HORVÁTH, RÓBERT KITLEI, MELINDA TÓTH.