...://msg.byu.edu/papers/GLWHart_enumeration.pdf
Gus L. W. Hart and Rodney W. Forcade, "Generating derivative structures from multilattices: Application to hcp alloys," Phys. Rev. B 80 014120 (July 2009) http://msg.byu.edu/papers/multi.pdf
Gus L. W. Hart, Lance J. Nelson, and Rodney W. Forcade, "Generating derivative structures at a fixed concentration," Comp. Mat. Sci. 59 101-107 (March 2012) http://msg.byu.edu/papers/enum3.pdf