Dubcek, T., Lelas, K., Jukic, D., Pezer, R., Soljacic, M., & Buljan, H. (2015). The Harper-Hofstadter Hamiltonian and conical diffraction in photonic lattices with grating assisted tunneling. New Journal of Physics, 17: 125002. doi:10.1088/1367-2630/17/12/125002.