@unpublished{Calderon2020,
  author 		  = {Luis Calderon and Leander Heldring},
  title       = {{Spatial standard errors for several commonly used M-estimators}},
  year        = {2020},
  note        = {Mimeo}
}
@article{Conley1999,
  author      = {T. G. Conley},
  title       = {{GMM estimation with cross sectional dependence}},
  journal     = {Journal of Econometrics},
  year        = {1999},
  volume      = {92},
  number      = {1},
  pages       = {1-45}
}
@incollection{Conley2008,
  author      = {T. G. Conley},
  title       = {{Spatial Econometrics}},
  editor      = {Steven N. Durlauf and Lawrence E. Blume},
  booktitle   = {{Microeconometrics}},
  publisher   = {London: Palgrave Macmillan},
  year        = {2008},
  pages       = {303-313}
}
