1. Available from National Technical Information Service, Springfield, Virginia, Accession No. COM-71-50406;F.R. Gossett,1959
2. B.K. MEADE (1967): “High-Precision Transcontinental Traverse Surveys”,Surveying and Mapping, Vol. XXVII No. 1, 41–46.
3. I.I. MUELLER (1969):Spherical and Practical Astronomy as Applied to Geodesy, Frederick Unger Publishing Co., New York, 414–416.
4. B. OSTLE (1963):Statistics in Research-Second Edition, The Iowa State University Press, Chapter 11, 278–362.
5. A.R. ROBBINS (1960): “Personal Equation in the Determination of Geodetic Azimuth”,Bulletin Geodesique, 57, 311–319.