@article{Lehner,
  author    = {Lehner, Martin},
  title     = {Das Stoffmengen-Problem l{\"o}sen - Erfolgreich reduzieren mit der 3R-Technik},
  series = {Die neue Hochschule},
  journal   = {Die neue Hochschule},
  number    = {3},
  pages     = {18 -- 20},
  subject      = {Education},
  language  = {de}
}
@book{LehnerWilms,
  author    = {Lehner, Martin and Wilms, Falko},
  title     = {Systemisch denken - klipp und klar},
  address   = {Z{\"u}rich},
  publisher      = {Fachhochschule Technikum Wien},
  subject      = {Thought Process},
  language  = {de}
}
@incollection{Lehner,
  author    = {Lehner, Martin},
  title     = {Was macht ein Prozess-Coach?},
  series = {Prozessmanagement mit System},
  booktitle = {Prozessmanagement mit System},
  publisher      = {Fachhochschule Technikum Wien},
  subject      = {Coaching},
  language  = {de}
}