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Karuna Kumar, K. and Ramana Rao, T. V. and dos Santos, Carlos A. C. and de Medeiros, Alexandre M. T. (2007) Estimation of incoming global solar radiation and its diffuse component at the surface in Paraiba state (NE Brazil). Il nuovo cimento C, 30 (6). pp. 543-555. ISSN 1826-9885
Karuna Kumar, K. and Ramana Rao, T. V. (2006) Dry and wet spells at Itabaina (NE Brazil). Il nuovo cimento C, 29 (6). pp. 617-622. ISSN 1826-9885