Olonkins, Sergejs, Vjaceslavs Bobrovs, and Girts Ivanovs. 2016. “FOPA Pump Phase Modulation and Polarization Impact on Generation of Idler Components”. Elektronika Ir Elektrotechnika 22 (4):77 - 81. https://doi.org/10.5755/j01.eie.22.4.15924.