On Parameters of Subfield Subcodes of Extended Norm-Trace Codes
  In this article we describe how to find the parameters of subfield subcodes of extended Norm--Trace codes. With a Gr\"obner basis of the ideal of the $\mathbb{F}_{q^r}$ rational points of the Norm--Trace curve one can determine the dimension of the subfield subcodes or the dimension of the trace code. We also find a BCH--like bound from the minimum distance of the original supercode. 
Heeralal Janwa and Fernando L. Pi\~nero
math.AG cs.IT math.AC math.CO math.IT math.NT