@Article{	  DiekertW15,
  author	= "Volker Diekert and Tobias Walter",
  title		= "Asymptotic Approximation for the Quotient Complexities of
		  Atoms",
  journal	= "Acta Cybernetica",
  year		= "2015",
  volume	= "22",
  pages		= "349--357"
}