Fs. Leite et P. Crouch, Closed forms for the exponential mapping on matrix Lie groups based on Putzer's method, J MATH PHYS, 40(7), 1999, pp. 3561-3568
We present closed forms for the exponential of some infinitesimal generator
s of Lie groups which play an important role in physics and engineering app
lications. These explicit forms are based on the Putzer's method. We also c
ompare this methodology and results with related work by other authors. (C)
1999 American Institute of Physics. [S0022-2488(99)00607-6].