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The honeycomb model of GL_n(C) tensor products I. Proof of the saturation conjecture 
J. Amer. Math. Soc.12 (1999), 10551090 
math.RT/9807160 

The honeycomb model of GL_n(C) tensor products II. Facets of the LittlewoodRichardson cone 
J. Amer. Math. Soc. 17 (2004), 1948. 

Notices Amer. Math. Soc. 48 (2001) No. 2, 175186 

Duke Math. J. 119 (2003), 221260 

A positive proof of the LittlewoodRichardson rule using the octahedron recurrence 
Electron. J. Combin. 11 (2004), Research Paper 61, 18 pp. (electronic); 