@article{CC_2007_36_3_a19,
     author = {Zagrodny, Dariusz},
     title = {A weak* approximation of subgradient of convex function},
     journal = {Control and Cybernetics},
     pages = {793--802},
     year = {2007},
     volume = {36},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CC_2007_36_3_a19/}
}