@article{1183535804, author = {Kahane, J.-P.}, title = {Best approximation in $L^1 \left( T \right)$}, journal = {Bull. Amer. Math. Soc.}, volume = {80}, number = {4}, year = {1974}, pages = { 788-804}, language = {en}, url = {http://dml.mathdoc.fr/item/1183535804} }
Kahane, J.-P. Best approximation in $L^1 \left( T \right)$. Bull. Amer. Math. Soc., Tome 80 (1974) no. 4, pp. 788-804. http://gdmltest.u-ga.fr/item/1183535804/