Kirstin J. Leath, Steven Johnson, Pietro Roversi, Timothy R. Hughes, Richard A. G. Smith, Lloyd Mackenzie, B. Paul Morgan, Susan M. Lea
Acta Crystallogr Sect F Struct Biol Cryst Commun. 2007 Aug 1; 63(Pt 8): 648–652. Published online 2007 Jul 28. doi: 10.1107/S1744309107033477