00548naa#a2200169#i#450# EN\\bibl\46896 20241103181427.7 1681-1208 20120825b2012####ek#y0engy0150####ca RU Classification of solar X-ray flares on X-ray measurements on board geostationary satellites ``Elektro'' Journal article Moscow Geophysical Center of the Russian Academy of Sciences 2012 5 с. Journal article local Nusinov A A Katyushina V V rjes.ru