Some Realization of $gl_q(n)$-covariant Oscillator Algebra and   $gl_q(n)$-covariant q-Virasoro Algebra with $q$ a root of unity
  In this paper some realization of $gl_q(n)$-covariant oscillators is obtained when $q$ is a root of unity. And the $gl_q(n)$-covariant q-Virasoro algebra is presented by using the $gl_q(n)$-covariant oscillators. 
W-S. Chung