by Lisse, C.M., Fernández, Y.R., A'Hearn, M.F., Grün, E., Käufl, H.U., Osip, D.J., Lien, D.J., Kostiuk, T., Peschke, S.B., Walker, R.G.
Published in Icarus (New York, N.Y. 1962) (01.10.2004)

by LIEN, D. J
Published in The Astrophysical journal (15.09.1984)

by LEWIS, T.W.;ANDERSON, R.J.;KERFELD, D.J.;LIEN, L.A
Year of Publication 16.05.1985