Gelfgat, Ya. A., Experience in Directional Turbodrilling in Starogroznensky Area, Gostoptekhizdat, Moscow, 1947.

Vadetskyi, Yu. V., Oil and Gas Well Drilling, Nedra Publishing House, Moscow, 1979.

Ibid.

Ioanessyan R.A., Turbodrilling of Vertical and Directional Wells, Moscow, Gostoptekhizdat, 1945.

Ibid.

Gelfgat Y.A., "On the history of directional wells drilling and oil field development with cluster drilling techniques using turbodrills in the U.S.S.R.," Of the U.S.S.R. Oil and Gas Industry History Veterans memoirs, Issue 1, VNIIOENG, Moscow, 1991, pp. 37-43

Bronzov A.S., Cluster Wells Construction at Oil and Gas Fields, Moscow, Gostoptekhizdat, 1962.

Kurus, I. I., Experience in Directional Well Drilling in Perm Region, GOSINTI, Moscow, 1958.

Bronzov, 1962.

Vadetskyi, 1979.

Kalinin, A. G., B. P. Nikitin, K. M. Solodky, and B. Z. Sultanov, Directional and Horizontal Well Drilling Handbook, Nedra Publishing House, Moscow, 1997.

Ibid.

Gelfgat, Ya. A., G. S. Barshai, M. I. Buyanovsky, and P. K. Chernousov, "Device for measuring the curvature and azimuth of boreholes during drilling," U.S.S.R. Inventors' certificate no. 80552, 1948.

Chepelev, V. G., S. V. Isakov, V. V. Abakanovich, and P. E. Golikov, "Results on development and introduction of telemetering and deviating systems for horizontal drilling with electrodrills and downhole hydraulic motors," Construction of the land and offshore oil and gas wells, no. 10 15, VNIIOENG, Moscow, 1995.

Ibid.

Ropyanoi, A. Yu. and V. Z. Skoblo, "Small-size telemetering systems," Condition and prospects of the domestic oil and gas fields, Drilling Contractors' Association, Moscow, 1999.

Chuprov, V. P., L.