@TechReport{reifer,
  author = 	 {D. J. Reifer},
  title = 	 {Software Management},
  institution =  {IEEE},
  year = 	 {1993},
  edition =      {Vierte},
}

@Book{veer,
  author = 	 {G. van der Veer and T. R. Green and J-M Hoc and D.},
  title = 	 {Working with Computers: Theory versus Outcome},
  publisher = 	 {Academic Press},
  year = 	 {1988},
}