Works citing   [Integral Methods in Science and Engineering, vol. 1, pp. 9-19, Birkhauser, Boston, 2009]

1. D. S. Grebenkov, B.-T. Nguyen:
   Geometrical structure of Laplacian eigenfunctions,
   SIAM Rev. 55 (2013) 601-667.
   
   
2. V. Felli and S. Terracini:
   Singularity of eigenfunctions at the junction of shrinking tubes, Part I,
   J. Differential Equations 255 (2013), 633-700.
   
   
3. E. Feireisl, T. Karper, O. Kreml, J. Stebel:
   Stability with respect to domain of the low Mach number limit of compressible viscous fluids,
   Math. Mod. Meth. Appl. S. 23 (2013), 2465-2493.
   
   
4. L. Abatangelo, V. Felli and S. Terracini:
   Singularity of eigenfunctions at the junction of shrinking tubes, Part II,
   J. Differential Equations 256 (2014), 3301-3334.
   
   
5. M. van den Berg, D. Bucur and K. Gittins:
   Maximising Neumann eigenvalues on rectangles,
   Bull. London Math. Soc. 48 (2016), 877-894.