[08]  E.K. SKARSOULIS, G.A. ATHANASSOULIS, "Classical methods for estimation of auto and cross-spectra", Internal Report, NTUA/Dept. NAME, April 1991 (93 pp.)

[07]  G.A. ATHANASSOULIS, E.K. SKARSOULIS, D.V. LYRIDIS, "Numerical simulation of ocean waves",Internal Report, NTUA/Dept. NAME, March 1991 (34pp.)

[06]  G.A. ATHANASOULIS, G.N. MAKRAKIS, "Some contributions to a non-geometric approach to ocean tomography", Internal Report, FORTH/IACM, September 1990, (28 pp.)

[05]  G.A. ATHANASOULIS, P.D. PARASKEVOPOULOS, "Convergent series expansions of acoustic potentials outside a two-dimensional scatterer of arbitrary shape. The radiation Dirichlet and Neumann problems",Internal Report, NTUA/Dept. NAME, July 1989 (58 pp.)

[04]  G.A. ATHANASSOULIS, C. MICHAILIDIS, "An expansion theorem for the two-dimensinal Neumann-Kelvin potential",Internal Report, NTUA/Dept. NAME, January 1988 (30 pp.)

[03]  G.A. ATHANASOULIS, G.N. MAKRAKIS, "A function-theoretic approach to a two-dimensional transient wave-body interaction problem",Internal Report, NTUA/Dept. NAME, August 1987 (30 pp.)

[02]  Th. Α. LOUKAKIS, G.Α. ATHANASSOULIS, "Το φάσμα των κυματισμών ανέμου και στατιστικά στοιχεία κυματισμού των Ελληνικών Θαλασσών",,Internal Report, NTUA/Dept. NAME, August 1983 (13+260 σελ.)

[01]  G.Α. ATHANASSOULIS, "Θεωρία των μεταβολών και σύμμορφη απεικόνιση απλά συνεκτικών χωρίων", Internal Report, NTUA/Dept. NAME, June 1981 (112 σελ.)