On the sup-norm of SL(3) Hecke-Maass cusp forms
  This work contains a proof of a non-trivial explicit quantitative bound in the eigenvalue aspect for the sup-norm of a SL(3,Z) Hecke-Maass cusp form restricted to a compact set. 
R. Holowinsky, K. Nowland G. Ricotta, E. Royer
math.NT