Interpolation with Harmonic and Complex Polynomials to Boundary Values J. Curtiss Indiana University Mathematics Journal 1960 text pdf 10.1512/iumj.1960.9.59010 10.1512/iumj.1960.9.59010 en Indiana Univ. Math. J. 9 (1960) 167 - 192 state-of-the-art mathematics http://iumj.org/access/