@Article{boehm,
  author = 	 {Barry W. Boehm},
  title = 	 {A Spiral Model of Software Development and Enhancement},
  journal =	 {ACM SIGSOFT Software Engineering Notes},
  year =	 {1986},
  volume =	 {11},
  number =	 {4},
  pages =	 {14--24},
  month =	 {August},
}

@Book{sommerville,
  author = 	 {Ian Sommerville},
  title = 	 {Software Engineering},
  publisher = 	 {Addison--Wesley},
  year = 	 {1995},
  edition =	 {F"unfte},
}

@Article{royce,
  author = 	 {W. W. Royce},
  title = 	 {Managing the Development of Large Software Systems:
		  Concepts and Techniques},
  journal =	 {WESCON Technical Papers},
  year =	 {1970},
  volume =	 {14},
}

@InCollection{comer,
  author = 	 {Edward R. Comer},
  title = 	 {Alternative Software Life Cycle Models},
  booktitle =	 {Software engineering},
  publisher =	 {IEEE Computer Society Press},
  year =	 {1997},
  pages =	 {404--414},
}

@Book{balzert,
  author = 	 {Helmut Balzert},
  title = 	 {Die Entwicklung von Software-Systemen: Prinzipien,
		  Methoden, Sprachen, Werkzeuge},
  publisher = 	 {Bibliographisches Institut},
  year = 	 {1982},
  address =	 {Mannheim, Wien, Z"urich},
  series =       {Informatik},
}