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2. N. N. Lebedev, Networks of Elongated Triangles with Measured Altitudes [in Russian], Nedra, Moscow (1968).
3. A. A. Karlson, ?Characteristics of the use of a traverse for determining the horizontal displacements of the Inguri arch dam,? Geod. Aerophotogr., No. 2 (1974).
4. A. N. Baranov (ed.), Geodesy in Tunnel Construction [in Russian], Part II, Geodezizdat, Moscow (1953).