@article{RSMUP_1966__36_1_66_0,
     author = {Sachs, David},
     title = {Reciprocity in matroid lattices},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {66--79},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {36},
     number = {1},
     year = {1966},
     mrnumber = {202646},
     zbl = {0145.01705},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1966__36_1_66_0/}
}