@incollection{Alt1971,
  author    = {Alt, Helmut},
  title     = {Fußball oder Mathematik},
  series = {Alma Mater Aquensis : Jahresbericht},
  booktitle = {Alma Mater Aquensis : Jahresbericht},
  pages     = {110 -- 114},
  year      = {1971},
  language  = {de}
}