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Nonlinear Analysis > 2008 > 69 > 3 > 1000-1010
Prakseologia > 2007 > 147 > 31-49
Prakseologia > 2007 > 147 > 31-49
Nonlinear Analysis > 2008 > 69 > 3 > 1000-1010
Prakseologia > 2007 > 147 > 31-49
Prakseologia > 2007 > 147 > 31-49