@misc{WahlRohatschWagner,
  author    = {Wahl, Harald and Rohatsch, Lukas and Wagner, Josef},
  title     = {GreisslerPLUS - Towards Local Supply in Rural Areas},
  subject      = {Supply of Goods},
  language  = {en}
}
@misc{WahlRohatschRinger,
  author    = {Wahl, Harald and Rohatsch, Lukas and Ringer, Nicole},
  title     = {Addressing the Challenges of Supplying People with Daily Consumer Goods in Rural Areas},
  subject      = {Supply of Goods},
  language  = {en}
}