00506naa#a2200157#i#450# EN\\bibl\95742 20250729055023.2 1813-4327 20250707b2025####ek#y0engy0150####ca RU TWO-STAGE SIGNATURE RESEARCH: VARIABILITY OR IMPERATIVE Journal article Volgograd Volgograd Academy of the Ministry of Internal Affairs of Russia 2025 0 с. Journal article local Ismatova Tat'yana Ivanovna va-mvd.editorum.ru