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Problem section |
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| Authors: | Alan J. Nelson Joshua Hoffman Robert Hoffman |
| Affiliation: | (1) Massachusetts Institute of Technology, 02139 Cambridge, Mass, USA;(2) University of North Carolina, 27412 Greensboro, North Carolina, USA;(3) York College, City University of New York, 11451 Jamaica, New York, USA |
| Abstract: | |
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