V. B. Ivanskyi, O. N. Letuchyy, OrobinskyiА. N., and H. V. Siroko, “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.