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- [3] LOCATION OF SINGULARITIES OF FEYNMAN DIAGRAMS SOVIET PHYSICS JETP-USSR, 1962, 15 (03): : 567 - 571
- [5] POSITIONS OF THE SINGULARITIES OF CERTAIN FEYNMAN DIAGRAMS SOVIET PHYSICS JETP-USSR, 1961, 13 (02): : 474 - 477
- [8] NEW METHOD OF INVESTIGATION OF SINGULARITIES OF FEYNMAN DIAGRAMS SOVIET PHYSICS JETP-USSR, 1964, 18 (03): : 703 - 711