JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS, vol. 228, no. 2, page. 467 - 482, 1998-12-15
ARCHIV DER MATHEMATIK, vol. 71, no. 6, page. 472 - 480, 1998-12-02
INDIAN JOURNAL OF PURE & APPLIED MATHEMATICS, vol. 29, no. 10, page. 983 - 989, 1998-10
GLASGOW MATHEMATICAL JOURNAL, vol. 40, page. 359 - 365, 1998-09
JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS, vol. 211, no. 1, page. 295 - 300, 1997-07-01
JOURNAL OF THE LONDON MATHEMATICAL SOCIETY-SECOND SERIES, vol. 54, page. 135 - 147, 1996-08
BULLETIN OF THE AUSTRALIAN MATHEMATICAL SOCIETY, vol. 52, no. 3, page. 475 - 486, 1995-12
JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS, vol. 190, no. 1, page. 203 - 210, 1995-02-15