@article{MS2_1990__66_1_167098,
     author = {Karl-Joachim Wirths},
     title = {An extremal problem for polynomials with a prescribed value at a given point of the real axis.},
     journal = {Mathematica Scandinavica},
     pages = {130--140},
     publisher = {mathdoc},
     volume = {66},
     number = {1},
     year = {1990},
     zbl = {0686.30001},
     url = {http://geodesic.mathdoc.fr/item/MS2_1990__66_1_167098/}
}