For citations:

Samoylenko A.A., Ivanov A.D., Levin G.G. Detection effciency measurement of single-photon detectors based on spontaneous parametric scattering using the heterodyning method. Izmeritel`naya Tekhnika. 2020;(8):28-35. (In Russ.) https://doi.org/10.32446/0368-1025it.2020-8-28-35