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Demonstratio Mathematica > 2017 > Vol. 50, nr 1 > 309--319
Nonlinear Analysis > 2013 > 81 > Complete > 211-223
Nonlinear Analysis > 2005 > 61 > 3 > 405-423
Demonstratio Mathematica > 2017 > Vol. 50, nr 1 > 309--319
Nonlinear Analysis > 2013 > 81 > Complete > 211-223
Nonlinear Analysis > 2005 > 61 > 3 > 405-423