Duvall, W. I., & Aggson, J. R. (1979). Least squares calculation of horizontal stress from more than three diametral deformations in vertical boreholes. Dept. of the Interior, Bureau of Mines.
Chicago Style (17th ed.) CitationDuvall, Wilbur I., and James R. Aggson. Least Squares Calculation of Horizontal Stress from More than Three Diametral Deformations in Vertical Boreholes. [Washington]: Dept. of the Interior, Bureau of Mines, 1979.
MLA (9th ed.) CitationDuvall, Wilbur I., and James R. Aggson. Least Squares Calculation of Horizontal Stress from More than Three Diametral Deformations in Vertical Boreholes. Dept. of the Interior, Bureau of Mines, 1979.
Warning: These citations may not always be 100% accurate.