@techreport{ApelLengauerBatoryetal.2022,
  author    = {S. Apel and C. Lengauer and D. Batory and Bernhard M{\"o}ller and C. K{\"a}stner},
  title     = {An algebra for feature-oriented software development},
  institution = {Fakult{\"a}t f{\"u}r Angewandte Informatik},
  pages     = {31},
  year      = {2022},
}