Jack Edmonds. Matroids and the greedy algorithm. Math. Program., 1(1):127-136, 1971. [doi]
@article{Edmonds71, title = {Matroids and the greedy algorithm}, author = {Jack Edmonds}, year = {1971}, doi = {10.1007/BF01584082}, url = {http://dx.doi.org/10.1007/BF01584082}, researchr = {https://researchr.org/publication/Edmonds71}, cites = {0}, citedby = {0}, journal = {Math. Program.}, volume = {1}, number = {1}, pages = {127-136}, }