@article{rota:1964:fct,
    author = {Rota, Gian-Carlo},
     title = {On the foundations of combinatorial theory. {I}. {T}heory of
              {M}\"obius functions},
   journal = {Z. Wahrscheinlichkeitstheorie und Verw. Gebiete},
    volume = {2},
      year = {1964},
     pages = {340–368},
   mrclass = {05.05},
  mrnumber = {MR0174487 (30 \#4688)},
mrreviewer = {M. A. Harrison},
       doi = {10.1007/BF00531932},
     zblno = {0121.02406}}