1. Arrambide, Mil., Dunn, R.B., Healy, A.W., Porter, R., Widner, A.L., November, L.J. and Spence, G.E., 1984. In ‘Astronomical Microdensitometry’, ed. D.E. Klinglesmith, NASA CP-2317, p. 277.
2. Jaschek, C., editor, 1989. ‘Digitized Optical Sky Surveys’, in Bull. Inform, du CDS, Number 37.
3. Kibblewhite EJ. Bridgeland M.T. Bunclark P. and Irwin M. 1984. In ‘Astronomical Microdensitometry’ ed. D.A. Klinglesmith NASA CP 2317 p. 277
4. Kinsey, J.H., Denman, RJ. and Evzerov, A., 1984. Rev. Sci. Instrum., 55, 1960.
5. Lasker, B.M., 1992. In ‘Digitised Optical Sky Surveys’, eds. H.T. MacGillivray and E.B. Thomson, Kluwer Academic Publishers, Dordrecht, p. 87.