@Article{	  Ben-AmramBP03ai,
  author	= "Ben-Amram, Amir M. and Berkmann, Omar and Petersen,
		  Holger",
  title		= "Element distinctness and sorting on one-tape off-line
		  Turing machines: a complete solution",
  journal	= "Acta Informatica",
  volume	= "40",
  number	= "2",
  year		= "2003",
  pages		= "81--94",
  editor	= " E.-R. Olderog",
  publisher	= "Springer-Verlag",
  doi		= "10.1007/s00236-003-0125-8"
}