Methods of calculation of normal forms.
                       Alexander D. Bruno

            Keldysh Institute for Applied Mathematics
            Miusskaja sq., 4, Moscow, 125047, Russia

                 e-mail:   bruno@applmat.msk.su
                  fax:      (+7+095) 972-07-37

    I compare 5 different methods of a computation of the  normal 
form:  direct, simple iterative, exponential iterative, quadratic 
and exponential quadratic.