The closed convex hull of the interpolating Blaschke products contains any bounded analytic function of sufficiently small norm.
@article{urn:eudml:doc:41297,
title = {The closed convex hull of the interpolating Blaschke products.},
journal = {Publicacions Matem\`atiques},
volume = {41},
year = {1997},
pages = {659-669},
mrnumber = {MR1485510},
zbl = {0894.30021},
language = {en},
url = {http://dml.mathdoc.fr/item/urn:eudml:doc:41297}
}
Oyma, Knut. The closed convex hull of the interpolating Blaschke products.. Publicacions Matemàtiques, Tome 41 (1997) pp. 659-669. http://gdmltest.u-ga.fr/item/urn:eudml:doc:41297/