@article{Weigand1994,
  author    = {Weigand, Christoph},
  title     = {Optimal Production Schedule for a K Products Single Machine Problem},
  series = {Economic Quality Control. 9 (1994)},
  journal   = {Economic Quality Control. 9 (1994)},
  isbn      = {0940-5151},
  pages     = {91 -- 101},
  year      = {1994},
  language  = {en}
}
@article{WeigandCollaniSaniga1994,
  author    = {Weigand, Christoph and Collani, E. v. and Saniga, E.M.},
  title     = {Economic Adjustment Design for -Control Charts. E.v.Collani, E.M. Saniga, Ch. Weigand},
  series = {IIE Transactions / Institute of Industrial Engineers. 26 (1994), H. 6},
  journal   = {IIE Transactions / Institute of Industrial Engineers. 26 (1994), H. 6},
  isbn      = {0569-5554},
  year      = {1994},
  language  = {en}
}