@Article{	  BuntrockDHM92mst,
  title		= "Structure and Importance of Logspace-MOD-Classes",
  journal	= "Math. Systems Theory",
  year		= "1992",
  volume	= "25",
  number	= "3",
  pages		= "223--237",
  issn		= "0025-5661",
  doi		= "10.1007/BF01374526",
  author	= "Buntrock, Gerhard and Damm, Carsten and Hertrampf, Ulrich
		  and Meinel, Christoph"
}