Abstract
This is the third and final part of a paper presented at the 1991 Pan-American Science Conference in Venezuela. The first part appeared in the January 1993 issue and the second in the March issue.
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George Marx1
Published under licence by IOP Publishing Ltd
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Citation George Marx 1993 Phys. Educ. 28 170
DOI 10.1088/0031-9120/28/3/007