How to solve it? Y is not only related with the same year's X, but also the previsous few years' X and Y

Sat, Mar 7, 2009 5:17 PM

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zhijie zhang How to solve it? Y is not only related with the same year's X, but also the previsous few years' X and Y Mar 7 Gabor Grothendieck How to solve it? Y is not only related with the same year's X, but also the previsous few years' X and Y Mar 7