00747naa#a2200181#i#450# EN\FGKOU VO SPBU MVD ROSSII\bibl\94668 20250725073810.5 2071-8284 20250626b2025####ek#y0engy0150####ca RUS RU The problem of defining and interpreting the concept of ‘secret protection’ in operative-investigative activities Journal article St. Petersburg SAINT-PETERSBURG UNIVERSITY OF THE MINISTRY OF INTERNAL AFFAIRS OF THE RUSSIAN FEDERATION 2025 6 с. Journal article local Уголовный розыск. Криминальная полиция. 351.745.7 RUS Tambovtsev Andrei Ivanovich vestnikspbmvd.ru