Mathematics Achievement of Chinese, Japanese and American Children

The original study was published in Science Magazine.
Mathematics Achievement of Chinese, Japanese and American Children.
Volume #231 - pp. 693-699,  Feb. 14, 1986. 
The authors were Harold Stevenson, Shin-Ying Lee and James W. Stigler. 

They published a follow up study in Science Magazine.

Mathematics Achievement of Chinese, Japanese and American Children: Ten Years Later
Volume #259 - pp 53-58, Jan 1, 1993. 
The studies were separated by 10 years even though the publication dates were not.

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Summary