@article{Gałkowski:1999,
  author  = "K. Gałkowski and A. Gramacki and J. Gramacki",
  title   = "Analysis of properties of multitime-scale systems in 2D approach",
  journal = "Lecture Notes in Control and Information Sciences : Progress in system and robot analysis and control design",
  volume  = "Vol. 243",
  pages   = "77--86",
  year    = "1999",
}