1. Institute for Systems Analysis, Russian Academy of Sciences, 9, pr. 60 let Octjabrja, Moscow, 117312, Russia
2. Dorodnicyn Computing Center, Russian Academy of Sciences, 40, Vavilova str., Moscow, 117967, Russia
3. University of Jyvaskyla Department of Mathematical Information Technology, P. O. Box 35 (Agora), FIN-40351 Jyvaskyla, Finland