Uniform (2,k)-generation of the 4-dimensional classical groups
  In this paper we study the (2,k)-generation of the finite classical groups SL(4,q), Sp(4,q), SU(4,q^2) and their projective images. Here k is the order of an arbitrary element of SL(2,q), subject to the necessary condition k>= 3. When q is even we allow also k=4. 
M. A. Pellegrini, M. C. Tamburini Bellani and M. A. Vsemirnov
math.GR