共 9 条
[1]
BARTA G, 1965, NASTOIASTEE PROSHLOE
[2]
BARTELS J, 1936, TERR MAGN, V41
[3]
BENKOVA NP, 1963, GEOM AER, V3
[4]
BOCHEV A, 1965, COMPT REND ACAD BULG, V18
[5]
Chapman S., 1962, GEOMAGNETISM
[6]
GEORGIEV C, UNPUBLISHED
[7]
LANCE DN, 1962, CHISLENIE METODI DLI
[8]
ZAGUSKIN L, 1960, SPRAVOCHNIK CHISLENI
[9]
ANNUAL MEAN VALUES G