Olonkins, S., V. Bobrovs, and G. Ivanovs. “FOPA Pump Phase Modulation and Polarization Impact on Generation of Idler Components”. Elektronika Ir Elektrotechnika, vol. 22, no. 4, Aug. 2016, pp. 77 -81, doi:10.5755/j01.eie.22.4.15924.