by Doering, R.F., Tucker, W.D., Stang, L.G.
Published in Journal of inorganic & nuclear chemistry (01.10.1960)

by Stang, L.G., Tucker, W.D., Doering, R.F., Weiss, A.J., Greene, M.W., Banks, H.O.
Published in The International journal of applied radiation and isotopes (1957)