25569 Alina Ostafe: Multivariate permutation polynomial systems and nonlinear
pseudorandom number generators. Finite Fields Appl. 16 (2010), 144-154.

25568 Alina Ostafe/Elena Pelican/Igor Shparlinski: On pseudorandom numbers from
multivariate polynomial systems. Finite Fields Appl. 16 (2010), 320-328.