00486naa#a2200169#i#450# EN\\bibl\12097 20250112233950.7 1609-3178 20160624b2016####ek#y0engy0150####ca RUS RU Frequency Dependence of Permeability Helps to Identify Different Steel Grades Journal article Saint-Petersburg LLC SVEN 2016 3 с. Journal article local Sandovskiy Vladimir zh-szf.ru