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Mathematische Nachrichten > 290 > 4 > 570 - 582
Journal of Mathematical Analysis and Applications > 2016 > 441 > 1 > 364-374
Nonlinear Analysis > 2015 > 129 > Complete > 143-159
Geometriae Dedicata > 2014 > 168 > 1 > 87-100
Geometriae Dedicata > 2011 > 151 > 1 > 27-39