Hartmut Ehrig Karsten Ehrig Claudia Ermel Frank Hermann Gabriele Taentzer Information Preserving Bidirectional Model Transformations. 72-86 2007 conf/fase/2007 FASE http://dx.doi.org/10.1007/978-3-540-71289-3_7 db/conf/fase/fase2007.html#EhrigEEHT07