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by Catherine Westbrook (Senior Lecturer and MRI Field Leader at Anglia Polytechnic University, Cambridge)
by University of Chicago School Mathematic Project
by John A. White (University of Arkansas ); Kenneth E. Case (Oklahoma State Univ.); David B. Pratt (Oklahoma State Univ.); et al.
by David E. Johnson (Birmingham Southern University); Johnny R. Johnson; John L. Hilburn; et al.
by Open University
by Young, Hugh D.; Freedman, Roger A.; Sandin, T. R.; et al.
by Shanks, Hershel
by Crowley, Sharon
by Berlinerblau, Jacques
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