@conference{Gaalman2019,
  author       = {G. Gaalman and S.M. Disney and X. Wang},
  title        = {When the bullwhip effect is an increasing function of the lead time},
  booktitle    = {30th Production and Operations Management Society Annual Conference},
  year         = {2019},
  address      = {Washington, USA},
  month        = {2nd-6th May},
  abstract     = {We show a positive demand impulse response leads to an "always increasing in the lead time bullwhip effect" when the order-up-to policy is used to make supply chain replenishment orders. Using the zero and poles of the ARMA(2,2) z-transform, we reveal when this demand impulse is positive.}
  }