1. Achchab, B., Agouzal, A., Bouihat, K.: A simple nonconforming quadrilateral finite element. C. R. Acad. Sci. Paris Ser. I 352, 529–533 (2014)
2. Achchab, B., Bouihat, K., Guessab, A., Schmeisser, G.: A general approach to the construction of nonconforming finite elements on convex polytope. Appl. Math. Comput. 268, 916–923 (2015)
3. Achchab, B., Guessab, A., Zaim, Y.: A new class of nonconforming finite elements for the enrichment of Q 1 element on convex polytope. Appl. Math. Comput. 271, 657–668 (2015)
4. Atkinson, K.E.: An Introduction to Numerical Analysis, 2nd edn. Addison-Wesley, Reading, MA (1975)
5. Babu s ̌ $$\check{\mathrm{s}}$$ ka, I., Banerjee, U., Osborn, J.E.: Survey of meshless and generalized finite element methods: a unified approach. Acta Numer. 12 (1), 1–125 (2003)