@book{heinrich:metastudie_oss,
 title     = {{Metastudie Open-Source-Software und ihre Bedeutung f{\"u}r
               Innovatives Handeln}},
 author    = {Hartmut Heinrich and Friedrich Holl and Katharina Menzel and
              Jan Tobias M{\"u}hlberg and Ingo Sch{\"a}fer and
              Hanno Sch{\"u}ngel},
 publisher = {Friedrich Holl, self-published},
 address   = {Berlin, Germany},
 year      = 2006,
 note      = {The study has been commissioned by the Federal Ministry
              of Education and Research of Germany.}
}