1. Introduction to Quantum Graphs;Berkolaiko,2013
2. Lattice Kronig–Penney models;Exner;Phys. Rev. Lett.,1995
3. Boundary Value Problems for Operator Differential Equations;Gorbachuk,1991
4. Hermitian symplectic geometry and extension theory;Harmer;J. Phys. A, Math. Gen.,2000
5. Kirchhoff's rule for quantum wires;Kostrykin;J. Phys. A, Math. Gen.,1999