Conjugate gradient FFT volume integral method FORTRAN program printed in
Manuel F. Catedra, Emilio Gago, Luis Nuno, 3 D BODY Computer Code
in W. Ross Stone (Ed.) Radar Cross Section of Complex Objects, IEEE Press, New York 1989 p. 150-183 (pages 160 and 161 interchanged!).
- Link (local 15 March 2021)