Satoru Fujishige. On the subdifferential of a submodular function. Math. Program., 29(3):348-360, 1984. [doi]
@article{Fujishige84b, title = {On the subdifferential of a submodular function}, author = {Satoru Fujishige}, year = {1984}, doi = {10.1007/BF02592001}, url = {http://dx.doi.org/10.1007/BF02592001}, researchr = {https://researchr.org/publication/Fujishige84b}, cites = {0}, citedby = {0}, journal = {Math. Program.}, volume = {29}, number = {3}, pages = {348-360}, }