@Article{	  GoellerNowotka08,
  author	= "G{\"o}ller, Stefan and Nowotka, Dirk",
  journal	= "Journal of Applied Logic",
  month		= "12",
  number	= "4",
  pages		= "606--608",
  title		= "A note on an extension of PDL",
  volume	= "6",
  year		= "2008"
}