@TechReport{	  it:2014-016,
  author	= {Torbj{\"o}rn Wigren},
  title		= {Identifiability and Limit Cycles},
  institution	= {Department of Information Technology, Uppsala University},
  department	= {Division of Systems and Control},
  year		= {2014},
  number	= {2014-016},
  month		= may,
  abstract	= {The report discusses when the non-linear dynamic equations
		  of a non-linear system in a limit-cycle can be determined
		  from measured data. The minimal order needed for this turns
		  out to be the minimal dimension in which the stable orbit
		  of the system does not intersect itself. This is
		  illustrated with a fourth order spiking neuron model, which
		  is identified using a non-linear second order differential
		  equation model.}
}