1. Higa T Wididana GN The concept and theories of effective microorganisms Proceedings of the First International Conference on Kyusei Nature Farming Parr JF Hornick SB Whitman CE U.S. Department of Agriculture Washington, DC 118 124
2. Beneficial and effective microorganisms for a sustainable agriculture and environment;Higa;Int Nat Farming Res Cent,1994
3. Rice and wheat production in Pakistan with effective microorganisms;Hussain;Am J Altern Agric,1999