Ramirez, David, Alejandro W. Rodriguez, Hila Hashemi, John D. Joannopoulos, Marin Soljacic, and Steven G. Johnson. 2011. “Degenerate Four-Wave Mixing in Triply-Resonant Nonlinear Kerr Cavities”. PRA 83: 033834. Referenced from pra.aps.org: Degenerate four-wave mixing in triply-resonant nonlinear Kerr cavities.