@misc{BuchholzCronedeBie2011,
  author    = {Buchholz, Wolfgang and Crone, Niklas and de Bie, Holger},
  title     = {Changing the Value Chain - Conceptional Framework and Case Studies for In- and Outsourcing Strategies, EIASM Colloquium on Organisational Change and Development - Advances, Challenges and Development, Malta 2011},
  year      = {2011},
  language  = {en}
}
@misc{BuchholzdeBieBach2014,
  author    = {Buchholz, Wolfgang and de Bie, Holger and Bach, Norbert},
  title     = {Determinanten zur Wahl von Concurrent Sourcing als duale Beschaffungsstrategie - Eine explorative empirische Untersuchung in der Landmaschinen- und Chemieindustrie, BME Wissenschaftssymposium, W{\"u}rzburg 2014},
  year      = {2014},
  language  = {de}
}
@misc{BuchholzdeBieBach2014,
  author    = {Buchholz, Wolfgang and de Bie, Holger and Bach, Norbert},
  title     = {Rationales and Industry Differences of Concurrent Sourcing in the German Agricultural and Chemical Industry. 23rd Annual International Purchasing and Supply Education and Research Association (IPSERA) Conference: "Purchasing and Supply Management in Difficult Times - The Sky is the Limit". Pretoria, S{\"u}dafrika. 13.-16. April 2014},
  year      = {2014},
  language  = {en}
}
@misc{HoltBuchholzdeBie2017,
  author    = {Holt, Christian and Buchholz, Wolfgang and de Bie, Holger},
  title     = {How to identify indirect material for global sourcing? Conceptualization of a portfolio matrix based on an exploratory empirical study, 26th Annual International Purchasing and Supply Education and Research Association (IPSERA) Conference: "Coping with the Future: Picking your Battles", Budapest/Balatonfured, Hungary , 2017},
  year      = {2017},
  language  = {en}
}