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- [4] MAGNETIC-FIELD AT EARTHS SURFACE PRODUCED BY A HORIZONTAL LINE CURRENT JOURNAL OF GEOPHYSICAL RESEARCH, 1974, 79 (31): : 4802 - 4804
- [5] SPHERICAL ANALYSIS OF CYCLIC VARIATION OF A HORIZONTAL COMPONENT OF EARTH MAGNETIC-FIELD GEOMAGNETIZM I AERONOMIYA, 1975, 15 (04): : 694 - 697
- [7] CONTRIBUTION OF EXTERNAL CURRENT SYSTEMS TO NEAR EARTH MAGNETIC-FIELD TRANSACTIONS-AMERICAN GEOPHYSICAL UNION, 1975, 56 (08): : 545 - 545