clusters. In this work, we use the parallel GMRES method~\cite{ref34}
as an inner iteration method to solve the
sub-systems~(\ref{sec03:eq03}). It is a well-known iterative method
-which gives good performances for solving sparse linear systems in
+which gives good performances to solve sparse linear systems in
parallel on a cluster of processors.
It should be noted that the convergence of the inner iterative solver
