@COLLECTION{lutterbeck:open_source_jahrbuch_2006,
  EDITOR       = {Lutterbeck, Bernd and B{\"a}rwolff, Matthias and Gehring,
                  Robert A.},
  TITLE        = {{O}pen {S}ource {J}ahrbuch 2006:
                  {Z}wischen {S}oftwareentwicklung und {G}esellschaftsmodell},
  BOOKTITLE    = {{O}pen {S}ource {J}ahrbuch 2006:
                  {Z}wischen {S}oftwareentwicklung und {G}esellschaftsmodell},
  PUBLISHER    = {Lehmanns Media -- LOB.de},
  ADDRESS      = {Berlin, Germany},
  YEAR         = {2006},
  MONTH        = mar,
  NOTE         = {Available online at
                  \url{http://www.opensourcejahrbuch.de/2006/}.}
}

@INCOLLECTION{muehlberg:se_und_quali_in_osproj,
  AUTHOR       = {{M}{\"u}hlberg, Jan Tobias},
  TITLE        = {{S}oftware {E}ngineering und {S}oftwarequalit{\"a}t in
                  {O}pen-{S}ource-{P}rojekten},
  PAGES        = {251 -- 262},
  CROSSREF     = {lutterbeck:open_source_jahrbuch_2006},
}