@Article{vdH:noeth,
  author = 	 {J. van der Hoeven},
  title = 	 {Operators on generalized power series},
  journal = 	 {Journal of the Univ. of Illinois},
  volume =       {45},
  number =       {4},
  year = 	 {2001},
  pages =        {1161--1190}
}