A. G. Gashua and  T. T. Bello and  I. Alhassan and  K. K. Gwiokura,  Response of Local Cowpea to Intra Row Spacing and Weeding Regimes in Yobe State, Nigeria.   journal   = {International Journal of Agricultural and Biosystems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2015, vol. 106(10). 1111 - 1114
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/10007315.