BiophysJ

Xu, Y., Colletier, J.-P., Weik, M., Jiang, H., Moult, J., Silman, I. & Sussman, J. L.
Flexibility of aromatic residues in the active-site gorge of acetylcholinesterase : X-ray versus molecular dynamics.
Biophys. J.  95, 500-2511 (2008).   [Abstract