@misc{iiasa4026,
           title = {Agro-Ecological Land Resources Assessment for Agricultural Development Planning: A Case Study for Kenya. Resources Data Base and Land Productivity: Technical Annex 7: Guide to Computer Programs for Land Productivity Assessments},
         address = {IIASA, Laxenburg, Austria},
       publisher = {XQ-94-804},
            year = {1994},
             url = {https://pure.iiasa.ac.at/id/eprint/4026/},
          author = {Kassam, A. H. and van Velthuizen, H. T. and Fischer, G. and Shah, M. M.}
}