Inverse parabolic problems and discrete orthogonality. D.S. Gilliam; J.R. Lund; C.F. Martin — 1991 Numerische Mathematik
A Discrete Sampling Inversion Scheme for the Heat Equation. D.S. Gilliam; J.R. Lund; C.F. Martin — 1989 Numerische Mathematik
The Fréchet derivative of an analytic function of a bounded operator with some applications. Gilliam, D.S.; Hohage, T.; Ji, X.; Ruymgaart, F. — 2009 International Journal of Mathematics and Mathematical Sciences