Linearly Constrained Interpolation in Nest Algebras M. BakonyiH. Woerdeman Indiana University Mathematics Journal 1993 text pdf 10.1512/iumj.1993.42.42059 10.1512/iumj.1993.42.42059 en Indiana Univ. Math. J. 42 (1993) 1297 - 1304 state-of-the-art mathematics http://iumj.org/access/