Part of this research was performed while the authors were visiting the Institute for Pure and Applied Mathematics (IPAM), which is supported by the National Science Foundation.
The first author was supported by the Austrian Science Fund (FWF): Project F5511-N26, which is part of the Special Research Program "Quasi-Monte Carlo Methods: Theory and Applications". The third author was supported by grant Russian Science Foundation RSF 14-11-00433.
Поступила в редакцию: 08.08.2014 Исправленный вариант: 24.07.2015 Принята в печать: 08.02.2016
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