@book{Liu2005,
  author    = {Liu, Weian},
  title     = {Monotone method for nonlocal systems of first order},
  series = {Preprint / Universit{\"a}t Potsdam, Institut f{\"u}r Mathematik, Arbeitsgruppe Partiell},
  journal   = {Preprint / Universit{\"a}t Potsdam, Institut f{\"u}r Mathematik, Arbeitsgruppe Partiell},
  publisher = {Univ.},
  address   = {Potsdam},
  issn      = {1437-739X},
  pages     = {16 S.},
  year      = {2005},
  language  = {en}
}
@unpublished{Liu2005,
  author    = {Liu, Weian},
  title     = {Monotone method for nonlocal systems of first order},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-29791},
  year      = {2005},
  abstract  = {In this paper, the monotone method is extended to the initial-boundary value problems of nonlocal PDE system of first order, both quasi-monotone and non-monotone. A comparison principle is established, and a monotone scheme is given.},
  language  = {en}
}