@article{MAN_1972__199_162317,
     author = {R.E..L. Turner},
     title = {On {Monotone} {Operator} {Functions} and {Interpolation.}},
     journal = {Mathematische Annalen},
     pages = {91--96},
     publisher = {mathdoc},
     volume = {199},
     year = {1972},
     zbl = {0231.47026},
     url = {http://geodesic.mathdoc.fr/item/MAN_1972__199_162317/}
}