High-order quasi–phase-matching harmonic generation in two-dimensional orthorhombic latticeBoqin Ma, Ting Wang, Peigen Ni, Bingying Cheng and Daozhong ZhangEurophys. Lett., 68 6 (2004) 804-810DOI: https://doi.org/10.1209/epl/i2004-10295-1