Banach Journal of Mathematical Analysis, vol. 9, no. 4, page. 243 - 258, 2015-04
QUARTERLY JOURNAL OF MATHEMATICS, vol. 59, page. 455 - 474, 2008-12
NONLINEAR ANALYSIS-THEORY METHODS & APPLICATIONS, vol. 95, page. 323 - 332, 2014-01
Transactions of the American Mathematical Society, vol. 367, no. 9, page. 6085 - 6101, 2015-09
STUDIA MATHEMATICA, vol. 178, no. 1, page. 63 - 82, 2007-03