Saying Hello World with GROOVE - A Solution to the TTC 2011 Instructive   Case
  This report presents a solution to the Hello World case study of TTC 2011 using GROOVE. We provide and explain the grammar that we used to solve the case study. Every requested question of the case study was solved by a single rule application. 
Amir Hossein Ghamarian, Maarten de Mol, Arend Rensink, Eduardo Zambon
cs.SE