Literature Cited
A. A. Orlov, V. Yu. Setkov, and É. I. Yalyshov, Ugol' Ukrainy, No. 7 (1969).
A. Hald, Statistical Theory with Engineering Applications, Wiley (1952).
Additional information
All-Union Scientific-Research Mine Survey Institute (VNIMI), Leningrad. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 12–17, July–August, 1973.
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Setkov, V.Y. Methods of recognizing periodic (secondary) roof sag. Soviet Mining Science 9, 359–363 (1973). https://doi.org/10.1007/BF02501164
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DOI: https://doi.org/10.1007/BF02501164