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Boundary Value Problems > 2014 > 2014 > 1 > 1-8
Cybernetics and Systems Analysis > 2012 > 48 > 4 > 586-591
Siberian Mathematical Journal > 2008 > 49 > 1 > 102-108
Boundary Value Problems > 2014 > 2014 > 1 > 1-8
Cybernetics and Systems Analysis > 2012 > 48 > 4 > 586-591
Siberian Mathematical Journal > 2008 > 49 > 1 > 102-108