Mukesh Singh Boori and  Venerando Eustáquio Amaro,  A Remote Sensing Approach for Vulnerability and Environmental Change in Apodi Valley Region, Northeast Brazil.   journal   = {International Journal of Geological and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2011, vol. 50(2). 93 - 103
    [viewed 18 May 2021]. Available from: https://publications.waset.org/pdf/7306.