Rast, S., Fries, P. H., Belorizky, E., Borel, A., Helm, L., & Merbach, A. E. (2001).
A general approach to the electronic spin relaxation of Gd(III) complexes in solutions. Monte Carlo simulations beyond the
Redfield limit. Journal of Chemical Physics, 115, 7554-7563.
doi:10.1063/1.1392364.