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Computational Mathematics and Mathematical Physics > 2014 > 54 > 4 > 582-597
Mathematical Notes > 2014 > 95 > 1-2 > 115-120
Nonlinear Analysis > 2011 > 74 > 18 > 7395-7403
Journal of Mathematical Analysis and Applications > 2011 > 379 > 1 > 171-179
Nonlinear Analysis > 2009 > 71 > 12 > e1442-e1447
Russian Mathematics > 2009 > 53 > 4 > 45-48
Theoretical and Mathematical Physics > 2008 > 157 > 3 > 1678-1693
Mathematical Notes > 2004 > 76 > 3-4 > 511-524
Mathematical Notes > 2003 > 74 > 3-4 > 510-519
Demonstratio Mathematica > 2002 > Vol. 35, nr 4 > 773-782