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Siberian Mathematical Journal > 2014 > 55 > 5 > 948-953
Journal of Fourier Analysis and Applications > 2009 > 15 > 6 > 816-838
Journal of Complexity > 2005 > 21 > 4 > 487-501
Journal of Dynamical and Control Systems > 1998 > 4 > 4 > 583-604