Demazure Modules and Perfect Crystals
  We give a criterion for the Demazure crystal $B_w(\lambda)$ defined by Kashiwara to have a tensor product structure. We study the $\sln$ symmetric tensor case, and see some Demazure characters are expressed using Kostka-Foulkes polynomials. 
Atsuo Kuniba, Kailash C. Misra, Masato Okado and Jun Uchiyama