00680naa#a2200205#i#450# EN\\bibl\52910 20250406155535.7 2587-9936 20200925b2020####ek#y0engy0150####ca RUS RU Unusual by duration and shape of the flare in blazar 3C454.3 Journal article Sevastopol Federal State Educational Institution of Higher Education Sevastopol State University 2020 11 с. Journal article local Солнце. Физика Солнца. 523.9 RUS Volvach Alexandr E Volvach Larisa N Larionov Michail G rusjbpc.ru