By Oliver, C., Ledsham, A., Elvin, R., Bindley, M.
By Nuffield Foundation
By Griffiths, David F., Higham, Desmond J.
By Kosslyn, Stephen Michael
By Scottish Primary Mathematics Group
By Russell, Andy
By Carstensen, Bendix
By Everitt, Brian S., Palmer, Christopher R., Horton, Robert
By O'Kelly, Michael, Ratitch, Bohdana
By Keck, Robert W., Patterson, Richard R.
By Jolly, Peter, Newman, Graham, Pledger, Keith
By Smith, Alan, Goldie, Sophie
By Marcus Du Sautoy
By SPMG, Scottish Primary Maths Group
By McGuire, Peter, Smith, Ken
By Peacocke, Arthur R.
By Kadelburg, Vesna, Woolley, Ben
By Rowland
By Fry, Dr Hannah, Oléron Evans, Dr Thomas
By Brummett, Randolph, etc.
By Johnson, David C., etc., Hart Kathleen, Brown, Margaret, Dickson, Linda, Clarkson, Rod
By Harris, Mary, Hoyles, Celia
By School Mathematics Project
By Fennema, Elizabeth, Romberg, Thomas A.
By Fauvel, John
By Ernest, Paul
By Joseph, George Ghevarghese
By Peter Clarke