00492naa#a2200169#i#450# EN\\bibl\47063 20241129034256.5 1681-1208 20020625b2002####ek#y0engy0150####ca RU A method for measuring the geomagnetic flux modulus Journal article Moscow Geophysical Center of the Russian Academy of Sciences 2002 2 с. Journal article local Yakupov V S Yakupov S V rjes.ru