WASET
Cardoso, L. , Souza, S. , Ferreira, F. , Ferreira, O. , Barboza, E. , Alhanati, C. (2011). 'Determination of the Specific Activity of Soil and Fertilizers in Sergipe - Brazil'. World Academy of Science, Engineering and Technology, Open Science Index 56, International Journal of Geological and Environmental Engineering, 5(8), 425 - 430.