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.

Summary