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Journal of Mathematical Analysis and Applications > 2011 > 384 > 2 > 192-197
Positivity > 2010 > 14 > 3 > 431-439
Functional Analysis and Its Applications > 2010 > 44 > 3 > 226-229
Functional Analysis and Its Applications > 2007 > 41 > 3 > 241-244
Nuclear Inst. and Methods in Physics Research, B > 1999 > 151 > 1-4 > 330-335
Studia Mathematica > 1993 > 105 > 3 > 255-269