no. 1
Reciprocity in matroid lattices
Rendiconti del Seminario Matematico della Università di Padova, Tome 36 (1966) no. 1, pp. 66-79. 
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     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://www.numdam.org/item/RSMUP_1966__36_1_66_0/}
}
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Sachs, David. Reciprocity in matroid lattices. Rendiconti del Seminario Matematico della Università di Padova, Tome 36 (1966) no. 1, pp. 66-79. http://www.numdam.org/item/RSMUP_1966__36_1_66_0/

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