Works citing   [Trans. Amer. Math. Soc. 367 (2015), 2921-2957.]

1. M. Astudillo, P. Kurasov and M. Usman:
   RJ -Symmetric Laplace Operators on Star Graphs: Real Spectrum and Self-Adjointness,
   Adv. Math. Phys. (2015) 649795.
   
   
2. M. Znojil:
   Quantum star-graph analogues of PT-symmetric square wells: Part II, spectra,
   Can. J. Phys. 93 (2015), 765-768.
   
   
3. R. Novak:
   Bound states in waveguides with complex Robin boundary conditions,
   Asympt. Anal. 96 (2016) 251-281.
   
   
4. P. Kurasov, B. M. Garjani:
   Quantum graphs: PT -symmetry and reflection symmetry of the spectrum,
   J. Math. Phys. 58 (2017) 023506.
   
   
5. J. Behrndt, M. Langer, V. Lotoreichik and J. Rohleder:
   Spectral enclosures for non-self-adjoint extensions of symmetric operators,
   J. Funct. Anal. 275 (2018) 1808-1888.
   
   
6. A. Grecu and L. I. Ignat:
   The Schrodinger equation on a star-shaped graph under general coupling conditions,
   J. Phys. A: Math. Theor. 52 (2019) 035202.
   
   
7. K.-J. Engel and M. K. Fijavz:
   Waves and diffusion on metric graphs with general vertex conditions,
   Evol. Equ. Control. Theory 8 (2019) 633-661.