@article{Koikawa:20023r,
  author = "Koikawa, Takao",
  title = "{Soliton equations by the noncommutative zero curvature formulation  }",
  doi = "10.22323/1.008.0021",
  journal = "PoS",
  year = 2002,
  volume = "unesp2002",
  pages = "021"
}