On a new identity for Kloosterman sums and nonlinear system of equations over finite fields of characteristic 2.

Tor Helleseth Victor A. Zinoviev On a new identity for Kloosterman sums and nonlinear system of equations over finite fields of characteristic 2. 109-124 2004 274 Discrete Mathematics 1-3 http://dx.doi.org/10.1016/S0012-365X(03)00083-9 db/journals/dm/dm274.html#HellesethZ04