@article{Zhao:101891,
      author = {Zhao, Yangshe},
      title = {{Method of Farmland Grading by MAPGIS-Taking Fengkai  County of Zhaoqing City in Guangdong as a Case}},
      journal = {Asian Agricultural Research},
      volume = {Volume 02},
      number = {Issue 10},
      pages = {9. - 5},
      year = {2010},
}