Gonçalo Antunes José Barateiro Manuel Cabral José Luis Borbinha Rodrigo Rodrigues Preserving digital data in heterogeneous environments. 345-348 2009 JCDL http://doi.acm.org/10.1145/1555400.1555457 conf/jcdl/2009 db/conf/jcdl/jcdl2009.html#AntunesBCBR09