Shapiro, J.C. and Brutlag, D.L. (2004). FoldMiner: Structural Motif Discovery Using an Improved Superposition Algorithm Protein Science 13(1) 278-294. AbstractFull Text
Singh, A.P. and Brutlag, D.L. (1997). Hierarchical Protein
Structure Superposition using both Secondary Structure and Atomic
Representations. Proc. Intelligent Systems for Molecular Biology5:284-293. Abstract