VANGUARD MEASUREMENTS GIVE PEAR-SHAPED COMPONENT OF EARTHS FIGURE

[1] HEISKANEN WA, 1958, EARTH ITS GRAVITATIO, P72

[2] Jeffreys H., 1952, EARTH

[3] PERTURBATIONS OF A CLOSE SATELLITE BY THE EQUATORIAL ELLIPTICITY OF THE EARTH [J]. ASTRONOMICAL JOURNAL, 1957, 62 (06) : 183 - 185

[4] SIRY JW, 1958, DISTRIBUTION ORBIT C

[1] HEISKANEN WA, 1958, EARTH ITS GRAVITATIO, P72

[2] Jeffreys H., 1952, EARTH

[3] PERTURBATIONS OF A CLOSE SATELLITE BY THE EQUATORIAL ELLIPTICITY OF THE EARTH [J]. ASTRONOMICAL JOURNAL, 1957, 62 (06) : 183 - 185

[4] SIRY JW, 1958, DISTRIBUTION ORBIT C