@misc{BuchholzGraweLuehrmann2015,
  author    = {Wolfgang Buchholz and Thomas Grawe and Matthias L{\"u}hrmann},
  title     = {How to apply buyer-supplier-supplier relationships for defining sourcing strategies. 24th Annual International Purchasing and Supply Education and Research Association (IPSERA) Conference: "Preparing for new competitive challenges". Amsterdam, Netherlands. 29. March -1. April 2015},
  institution = {Wirtschaft (MSB)},
  type      = {lecture},
  year        = {2015},
}