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- [7] CERTAIN PROBLEMS IN OBTAINING INFORMATION REGARDING COURSE OF OPEN-HEARTH FURNACE HEATS STAL IN ENGLISH-USSR, 1966, (07): : 529 - +
- [8] PROBLEMS IN OBTAINING GREY LITERATURE IFLA JOURNAL-INTERNATIONAL FEDERATION OF LIBRARY ASSOCIATIONS, 1995, 21 (02): : 94 - 98
- [9] Lawless methods of obtaining information LEGAL SCIENCE AND PRACTICE-BULLETIN OF NIZHNIY NOVGOROD ACADEMY OF THE MINISTRY IF THE INTERIOR OF RUSSIA, 2006, 6 (01): : 263 - 268