@article{GDZPPN002347865, title = {An Extremal Problem Related to Bernstein's Approximation Problem.}, journal = {Mathematica Scandinavica}, volume = {14}, year = {1964}, pages = {131-141}, zbl = {0146.08201}, url = {http://dml.mathdoc.fr/item/GDZPPN002347865} }
Wahde, Gösta. An Extremal Problem Related to Bernstein's Approximation Problem.. Mathematica Scandinavica, Tome 14 (1964) pp. 131-141. http://gdmltest.u-ga.fr/item/GDZPPN002347865/