Javier Alonso Luís Moura Silva Artur Andrzejak Paulo Silva Jordi Torres High-available grid services through the use of virtualized clustering. 34-41 2007 conf/grid/2007 GRID http://dx.doi.org/10.1109/GRID.2007.4354113 db/conf/grid/grid2007.html#AlonsoSAST07