Works citing   [R. Soc. Lond. Proc. Ser. A Math. Phys. Eng. Sci. 460 (2004), 3457-3467]

1. D. Borisov and G. Cardone:
   Planar waveguide with "twisted" boundary conditions: Discrete spectrum,
   J. Math. Phys. 52, 12, (dec 2011), art. no. 123513.
   
   
2. A. L. Delitsyn, B. T. Nguyen and D. S. Grebenkov:
   Trapped modes in finite quantum waveguides,
   Eur. Phys. J. B 85, (2012), art. no. 176.
   
   
3. D. S. Grebenkov, B.-T. Nguyen:
   Geometrical structure of Laplacian eigenfunctions ,
   SIAM Rev. 55 (2013) 601-667.
   
   
4. S. Kondej:
   Schrodinger operator with a strong varying interaction on a curve in R^2,
   J. Math. Phys. 54 (2013) 093511.
   
   
5. B. Brandolini, F. Chiacchio, E. B. Dryden and J. J. Langford:
   Sharp Poincare inequalities in a class of non-convex sets,
   J. Spectr. Theory 8 (2018) 1583-1615.