PEŘINA, J. Quantum properties of counterpropagating two-photon states generated in a planar waveguide. Physical Review A. 2008, 77(1), 013803/1-013803/14. ISSN 1050-2947. E-ISSN 2469-9934. Dostupné z: https://doi.org/10.1103/PhysRevA.77.013803