By School Mathematics Project
By Cairns, Conrad
By Anne Topping, Paul Oldham, Trevor Clifford
By School Mathematics Project, Unnamed
By Boitani, Piero, Mann, Jill
By Nigel Webb, Roger Blackmore
By Daniels, Christopher
By Gorman, Michael
By Butler, Paul, Carrington, David, Ellis, Graham
By Brown, Gillian, Anderson, Anne, Shillcock, Richard, Yule, George
By Bolt, Brian
By Allison, Linda
By Lambert, David
By Wood, Jeffrey, Wood, Lynn