@article{LorenzSaalfrank2015,
  author    = {Ulf Lorenz and Peter Saalfrank},
  title     = {Measures for the non-Markovianity of a harmonic oscillator coupled to a discrete bath derived from numerically exact references},
  journal   = {The European physical journal : D, Atomic, molecular, optical and plasma physics},
  volume    = {69},
  number    = {2},
  doi       = {10.1140/epjd/e2014-50727-8},
  year      = {2015},
}