Search results
Integral Equations and Operator Theory > 2011 > 69 > 2 > 183-201
Journal of Mathematical Analysis and Applications > 2010 > 369 > 1 > 368-376
Mathematische Nachrichten > 283 > 9 > 1304 - 1313
Journal of Mathematical Analysis and Applications > 2009 > 357 > 1 > 214-224