00704naa#a2200181#i#450# EN\FGKOU VO SPBU MVD ROSSII\bibl\101517 20251224123019.3 2071-8284 20251230b2025####ek#y0engy0150####ca RUS RU A private theory of secrecy in operative-investigative activities: from idea to implementation Journal article St. Petersburg SAINT-PETERSBURG UNIVERSITY OF THE MINISTRY OF INTERNAL AFFAIRS OF THE RUSSIAN FEDERATION 2025 9 с. Journal article local Ведение следствия. Розыск. 343.102 RUS Pavlichenko Nikolay Vladimirovich vestnikspbmvd.ru