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Journal of Functional Analysis > 2014 > 267 > 2 > 452-476
Journal of Computational and Applied Mathematics > 2006 > 197 > 2 > 558-567
Journal of Functional Analysis > 2014 > 267 > 2 > 452-476
Journal of Computational and Applied Mathematics > 2006 > 197 > 2 > 558-567