1. Choi, J. H. and Y. S. Choi, Precise determination of the geodetic primary frameworks of Korea, J. Korean Soc. Geod., Photogramm. Cartogr., 11, No. 1, 483–486, 1994 (in Korean).
2. Choi, J. H. and H. Sato, Horizontal strain of the crust in Korea inferred from geodetic data, J. Geod. Soc. Japan, 43, 159–180, 1997.
3. Geographical Survey Institute, 100 Years History of Surveying, Special Publication, pp. 456–486, Japanese Association of Surveyors, 1970 (in Japanese).
4. Hagiwara, Y., Analysis of gravity values in Japan, Bull. Earthq. Rec. Inst., 45, 1091–1228, 1967.
5. Harada, T., Relation degree of freedom of geodetic networks and defect of rank in normal equation of the free network adjustment, J. Geod. Soc. Japan, 35, 287–297, 1989 (in Japanese).