by Elliott, D.E., Stephens, T., Barabas, M.F., Beckman, G., Bonnin, J., Bricard, A., Brumleve, T.D., Delancey, G.B., Kruissink, Ch.A., Lane, G.A., Laws, W.R., Robertson, R.F.S., Schroeder, J.
Published in Energy (Oxford) (1977)