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Nonlinear Analysis–Theory and Methods, Springer Monographs in Mathematics, 558 References References 1. G. Acosta, R.G. Durán, An optimal Poincaré inequality in L1 for convex domains. Proc. Am. Math. Soc. 132, 195–202 (2004) 2. R.A. Adams, Sobolev Spaces (Academic Press, New York, 1975) 3. R.A. Adams, J. Fournier, Sobolev Spaces, 2nd edn. (Academic Press (Elsevier), Amsterdam, 2003) 4. D. Adams, L. Hedberg, Function Spaces and Potential Theory (Springer, Berlin, 1996) 5. S. Aizicovici, N.S. Papageorgiou, V. Staicu, Degree Theory for Operators of Monotone Type and Nonlinear Elliptic Equations with Inequality Constraints, Memoirs American Mathemat- ical Society, vol. 196, No. 915 (2008) 6. S. Aizicovici, N.S. Papageorgiou, V. Staicu, The spectrum and an index formula for the Neu- mann p-Laplacian and multiple solutions for problems with a crossing nonlinearity. Discret. Contin. Dyn. Syst. 25, 431–456 (2009) 7. N.I. Akhiezer, I.M. 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