Large scale scientific computing : 6th international conference LSSC 2007 Sozopol Bulgaria June 5 9 2007 ; revised papers Plenary and invited papers Robust multilevel and hierarchical preconditioning methods Monte Carlo : tools applications distributed computing Operator splittings their application and realization Recent advances in methods and applications for large scale computations and optimization of coupled engineering problems Control systems Environmental modelling Computational grid and large scale problems Application of metaheuristics to large scale problems Contributed talks