1. Hrachya Astsatryan, Institute for Informatics and Automation Problems of the National Academy of Sciences of the Republic of Armenia; 1, P. Sevak Str. Yerevan 0014 Armenia
2. Institut de Recherche en Informatique de Toulouse; 118 Route de Narbonne Toulouse F-31062 Toulouse Cedex 9 France
3. SURFNET; Moreelsepark 48 Utrecht 3511 EP Netherlands
4. Poznan Supercomputing and Networking Center; ul. Noskowskiego 10 Poznan 61-704 Poland