By Farmer, Penelope
By Howell, Gillian
By McNab, Rosi, Sharp, Ruth
By Orrell, Julie
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By Moran, Joe
By Ben Ambridge
By Flanagan, Cara
By Patrick, Patricia G., Dale Tunnicliffe, Sue
By Hickman, Katie
By Peiffer, Vera
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By Chantreuil, Frederic, Hanrahan, Kevin F., van Leeuwen, Myrna
By Dev, Harveer, Metcalfe, David, Boursicot, Katharine, Sales, David
By Sonak, Sangeeta M.
By Elle, Klaus
By Yu, Byung Pal
By Salomon, Markus, Till
By Mauser, Wolfram, Prasch, Monika
By EDWARDS; ROWAN;
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By Heymann, Jody, Barrera, Magda
By Loveday
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By Hyde, Maggie, Maggie; McGuinness, Michael
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By Bruguière, Catherine, Tiberghien, Andree, Clement, Pierre
By School Mathematics Project
By Toksvig, Sandi
By Nikles, Jane, Mitchell, Geoffrey