@Article{	  HertrampfRV00ipl,
  title		= "A note on closure properties of logspace {MOD} classes",
  journal	= "Information Processing Letters",
  year		= "2000",
  volume	= "75",
  number	= "3",
  pages		= "91--93",
  issn		= "0020-0190",
  doi		= "10.1016/S0020-0190(00)00091-0",
  author	= "Hertrampf, Ulrich and Reith, Steffen and Vollmer,
		  Heribert"
}