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Control and Cybernetics > 2007 > Vol. 36, no 3 > 727-754
Journal of Mathematical Analysis and Applications > 2004 > 289 > 2 > 584-607
Czechoslovak Mathematical Journal > 2004 > 54 > 4 > 1065-1075
Bulletin des sciences mathematiques > 2003 > 127 > 6 > 549-556