@article{JCA_2003_10_1_JCA_2003_10_1_a7,
     author = {Z. Artstein and C. C. Popa},
     title = {Convexity and the {Natural} {Best} {Approximation} in {Spaces} of {Integrable} {Young} {Measures}},
     journal = {Journal of convex analysis},
     pages = {169--184},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {2003},
     url = {http://geodesic.mathdoc.fr/item/JCA_2003_10_1_JCA_2003_10_1_a7/}
}