“MEASUREMENT OF THE MAIN CHARACTERISTICS OF PuBe AND 238PuBe NEUTRON SOURCES USING BONNER SPHERE SPECTROMETER WITH A 3He-COUNTER”, East Eur. J. Phys., vol. 4, no. 2, pp. 53–65, Aug. 2017, doi: 10.26565/2312-4334-2017-2-07.