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by David Halliday (University of Pittsburgh ); Robert Resnick (Rensselaer Polytechnic Institute); Jearl Walker (Cleveland State University )
by William G. McCallum (University of Arizona); Eric Connally (Harvard University Extension ); Deborah Hughes-Hallett (University of Arizona); et al.
by Maki, Daniel; Thompson, Maynard
by Williams, Tennessee
by Robert J. Berg (Bowling Green State Univ.); Fabrice Leroy (Bowling Green State University)
by R. Richard Ritti (The Pennsylvania State University); Steve Levy (California State University, San Bernardino)
by Michael D. Oates (University of Northern Iowa); Jacques Dubois (University of Northern Iowa)
by Eric Connally (Harvard University Extension); Deborah Hughes-Hallett (The University of Arizona); Andrew M. Gleason (Harvard Univ.); et al.
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