1. Submodular functions, matroids and certain polyhedra;Edmond,1970
2. Matroids and the greedy algorithm;Edmonds;Math. Programming,1971
3. Die Bestimmung maximaler Elemente in monotonen Mengensystemen;Euler,1977
4. A greedy algorithm for solving a class of linear programmes;Dunstan;Math. Programming,1973
5. U. Faigle, Geometries on partially ordered sets, to appear in J. Combinatorial Theory B.