by Pikaev, A.K., Kartasheva, L.I., Potapova, Z.M., Kharlamov, V.T.
Published in Radiation physics and chemistry (1978)

by Levin, V.I., Kozlova, M.D., Malinin, A.B., Sevastianova, A.S., Potapova, Z.M.
Published in The International journal of applied radiation and isotopes (01.01.1974)