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Boletín de la Sociedad Matemática Mexicana > 2016 > 22 > 2 > 583-604
Chinese Annals of Mathematics, Series B > 2013 > 34 > 4 > 623-638
Integral Equations and Operator Theory > 2007 > 58 > 1 > 1-33
Boletín de la Sociedad Matemática Mexicana > 2016 > 22 > 2 > 583-604
Chinese Annals of Mathematics, Series B > 2013 > 34 > 4 > 623-638
Integral Equations and Operator Theory > 2007 > 58 > 1 > 1-33