@article{JCA_2013_20_2_JCA_2013_20_2_a11,
     author = {G. E. Ivanov},
     title = {On {Well} {Posed} {Best} {Approximation} {Problems} for a {Nonsymmetric} {Seminorm}},
     journal = {Journal of convex analysis},
     pages = {501--529},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {2013},
     url = {http://geodesic.mathdoc.fr/item/JCA_2013_20_2_JCA_2013_20_2_a11/}
}