@article{JCA_2014_21_3_JCA_2014_21_3_a2,
     author = {L. Cheng and Y. Zhou},
     title = {Approximation by {DC} {Functions} and {Application} to {Representation} of a {Normed} {Semigroup}},
     journal = {Journal of convex analysis},
     pages = {651--661},
     publisher = {mathdoc},
     volume = {21},
     number = {3},
     year = {2014},
     url = {http://geodesic.mathdoc.fr/item/JCA_2014_21_3_JCA_2014_21_3_a2/}
}