ISRAEL JOURNAL OF MATHEMATICS, vol. 180, no. 1, page. 93 - 118, 2010-12
PUBLICATIONS OF THE RESEARCH INSTITUTE FOR MATHEMATICAL SCIENCES, vol. 46, no. 1, page. 171 - 182, 2010-02
GLASGOW MATHEMATICAL JOURNAL, vol. 47, page. 395 - 403, 2005-05
MATHEMATISCHE NACHRICHTEN, vol. 281, no. 9, page. 1264 - 1272, 2008-09
JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS, vol. 360, no. 2, page. 752 - 753, 2009-12-15