Geodesic
On the general definition of a matroid and a greedoid
Doklady Akademii Nauk, Tome 292 (1987) no. 1, pp. 15-20.

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     author = {I. M. Gel'fand and V. V. Serganova},
     title = {On the general definition of a matroid and a greedoid},
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I. M. Gel'fand; V. V. Serganova. On the general definition of a matroid and a greedoid. Doklady Akademii Nauk, Tome 292 (1987) no. 1, pp. 15-20. http://geodesic.mathdoc.fr/item/DAN_1987_292_1_a1/