Maximal Non-commuting Sets in Certain Unipotent Upper-triangular Linear   Groups
  We find the exact size of a maximal non-commuting set in unipotent uppertriangular linear group $UU_4(\mathbb{F}_q)$ in terms of a non-commuting geometric structure (Refer Definition [10]), where $\mathbb{F}_q$ is the finite field with $q$ elements. Then we get bounds on the size of such a set by explicitly finding certain non-commuting sets in the non-commuting structure. 
C.P. Anil Kumar and S.K. Prajapati
math.NT