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June 01 1988

Chen‐Zhong Yang

Bao‐Wen Wei;

Bao‐Wen Wei

Institute of Modern Physics, Lanzhou, China

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Jing‐Ye Zhang;

Jing‐Ye Zhang

Institute of Modern Physics, Lanzhou, China

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Roy Middleton

Roy Middleton

University of Pennsylvania, Philadelphia, Pennsylvania

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Physics Today 41 (6), 122 (1988);

https://doi.org/10.1063/1.2811481