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Developing thinking in algebra / John Mason, with Alan Graham and Sue Johnston-Wilder . London : Open University in association with SAGE Publications, 2005 . xii, 324 s . ISBN 978-1-4129-1171-9 (dotisk : brož.). ISBN 978-1-4129-1170-2 (váz. : dotisk). ISBN 1-4129-1171-0 (brož.). ISBN 1-4129-1170-2 (váz.) .   [1, currently available 1]