@InProceedings{	  ddm10,
  author	= "Diekert, Volker and Duncan, Andrew J. and Myasnikov,
		  Alexei G.",
  title		= "Geodesic rewriting systems and pregroups",
  booktitle	= "Combinatorial and Geometric Group Theory",
  series	= "Trends in Mathematics",
  editor	= "Bogopolski, O. and Bumagin, I. and Kharlampovich, O. and
		  Ventura, E.",
  publisher	= "Birkh{\"a}user",
  year		= "2010",
  pages		= "55--91",
  doi		= "10.1007/978-3-7643-9911-5_3"
}