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- [5] SPATIAL-ASPECTS OF DROUGHT IN THE SAHEL [J]. JOURNAL OF ARID ENVIRONMENTS, 1990, 18 (03) : 279 - 293
- [9] TEMPORAL AND SPATIAL-ASPECTS OF DIFFUSION OF TECHNOLOGY [J]. IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS, 1979, 9 (12): : 829 - 839