1. Bianchi, S. and Mussio, P. (1982), Mem.S.A.I.T., 53, 195
2. Bormann, L. and Karr, R. (1980), Evaluating the friendliness of time sharing systems, SIGSOC Bull. 12
3. Chiappetti, L., Garilli, B. and Rampini, A. (1983) ‘An interactive system for Exosat Image Processing’, 7th European Regional Astronomy Meeting, Florence
4. Klinglesmith, D.A. (1975) in Image Processing Techniques in Astronomy, ed. de Jaeger and Nieuwenhuijzen, Reidel Publishing Company, p. 271
5. Middelburg, F. and Crane, P. (1979) in’ Image processing in Astronomy’, eds. Sedmak, G., Capaccioli, M. and Allen, R.J., Osservatorio Astronomico di Trieste, p. 25