To cite midastouch in publications use:

  Philipp Gaffert, Florian Meinfelder, Volker Bosch (2015). Towards an
  MI-proper Predictive Mean Matching Discussion Paper, 1-14. URL
  https://www.uni-bamberg.de/fileadmin/uni/fakultaeten/sowi_lehrstuehle/statistik/Personen/Dateien_Florian/properPMM.pdf

A BibTeX entry for LaTeX users is

  @Article{,
    title = {{midastouch}: Towards an MI-proper Predictive Mean Matching},
    author = {Philipp Gaffert and Florian Meinfelder and Volker Bosch},
    journal = {Discussion Paper},
    year = {2015},
    pages = {1--14},
    url = {https://www.uni-bamberg.de/fileadmin/uni/fakultaeten/sowi_lehrstuehle/statistik/Personen/Dateien_Florian/properPMM.pdf},
  }