1. S. N. Aleksandrov, Voprosy Onkol., No. 4, 417–423 (1956).
2. N. V. El'tsina, Voprosy Onkol., No. 3, 312–315 (1956).
3. N. N. Zhukov-Verezhnikov, I. N. Maiskii, V. S. Gostev, Proceedings of the 10th Session of the General Council of the AMN SSSR, pp. 38–41, Moscow, 1956 [In Russian].
4. L. A. Zil'ber, V. A. Artamonova, G. M. Frank et al., Med. Radiol., No. 2, 17–22 (1956).
5. L. I. Il'ina, V. D. Blokhina and M. S. Uspenskaya, Med. Radiol., No. 4, 23–30 (1957).