@article{PIM2_1980__28(42)_258468,
     author = {Chatterjee, Dipak},
     title = {-convexity and best approximation.},
     journal = {Publications de l 'Institut Math\'ematique. Nouvelle S\'erie},
     pages = {43},
     publisher = {mathdoc},
     volume = {28(42)},
     year = {1980},
     zbl = {0485.41024},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/PIM2_1980__28(42)_258468/}
}