General discussion অনুযায়ী Hancock, G, Hackett, P, Rayner, D, Humphries, M, Dietrich, P, Quack, M, Seyfang, G, Lupo, D, Levy, MR, Brickman, R, Cox, D, Kaldor, A, Sutcliffe, E, Hutson, J, King, D, Houston, P, Freed, K, McCoustra, MRS, Pfab, J, Castleman, A, Sarre, P, Zare, R, Simons, J, Gorry, P, Rosmus, P