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2. P. RICHARDUS and J.S. ALLMAN: “Project Surveying”, North Holland Co. Amsterdam, 1966.
3. V. ASHKENAZI: “Solution and Error Analysis of Large Geodetic Networks— Direct Methods”, Survey Review XIX, Nos. 146 and 147, 1967.
4. V. ASHKENAZI: “Adjustment of Control Networks for Precise Engineering Surveys”, Chartered Surveyor, No. 102, 1970.
5. V. ASHKENAZI: “The Weighting of Geometric Control Networks”, Proc. Int. Conf. on Methods and Instruments for Densification of Geodetic Networks, Section 1A, Budapest, 1970.