@phdthesis{Cramer2006,
  author    = {Cramer, Marcus},
  title     = {Quasi-free systems on general lattices : criticality, entanglement-area laws, and single-copy entanglement},
  address   = {Potsdam},
  pages     = {99 S. : graph. Darst.},
  year      = {2006},
  language  = {en}
}