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- [46] On the Global Character of the System of Piecewise Linear Difference Equations [inline-graphic not available: see fulltext] and [inline-graphic not available: see fulltext] Advances in Difference Equations, 2010
- [49] Generalized [inline-graphic not available: see fulltext] Invariant Monotonicity and Generalized [inline-graphic not available: see fulltext] Invexity of Nondifferentiable Functions Journal of Inequalities and Applications, 2009