Optimal control of coupled spin dynamics: design of NMR pulse sequences by gradient ascent algorithms.
Khaneja N, Reiss T, Kehlet C, Schulte-Herbrüggen T, Glaser SJ. Optimal control of coupled spin dynamics: design of NMR pulse sequences by gradient ascent algorithms. J Magn Reson. 2005 Feb; 172(2):296-305.