By Zack Vicki   Graves Barbara   in Educational Studies in Mathematics

ISSN:0013-1954|46|1-3|229-271

Springer Publishing Company ‎(2001)‎

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By Hollenhorst Peter C.   Jones David A.   Graves Barbara J.   in Nucleic Acids Research

ISSN:1362-4962|32|18|5693-5702

Oxford University Press‎(2004)‎

Access to resources Favorite 7.130162