@article{PORMA_1983__42_4_115558,
     author = {Thaheem, A.B.},
     title = {Existence of best approximations},
     journal = {Portugaliae mathematica},
     pages = {435--440},
     publisher = {mathdoc},
     volume = {42},
     number = {4},
     year = {1983},
     mrnumber = {0836121},
     zbl = {0585.41031},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1983__42_4_115558/}
}