1. M. L. Brzhezinskii et al., Tr. VNIIM, No. 78 (138) (1965).
2. P. E. Ciddor, Metrologia, No. 4 (1971).
3. V. M. Sikharulidze et al., Izmer. Tekh., No. 7 (1972).
4. V. M. Sikharulidze et al., Izmer. Tekh., No. 11 (1973).
5. V. M. Sikharulidze, Abstracts for the Third Republican Conference on Metrology, Part 1 [in Russian], Metsniereba, Tbilisi (1974).