Dickey J.M., P.L. Bender, J.E. Faller, X.X. Newhall, R.L. Ricklefs, J.G. Ries, P.J. Shellus, C. Veillet, A.L. Whipple, J.R. Wiant, and J.G. Williams, Science 265, 482-490 (1994).
Bender P.L., J.E. Faller, J.L. Hall, J.J. Degnan, J.M. Dickey, X.X. Newhall, J.G. Williams, R.W. King, L.O. Macknik, D. O'Gara, and R.L. Ricklefs, in (AIP, Annapolis, Maryland (Usa), 1990).