Aphipan Pookpakdi, Prachya Rodjakhen, and Phadungsith Inchaiya, “ On-farm Preliminary Study on the Possibility of Establishing soybean as Sole Crop or Intercropping with Rice under Saturated Soil Culture”, Agr. Nat. Resour., vol. 25, no. 3, pp. 275–281, Sep. 1991.