Antonio Mucherino Inken Wohlers Gunnar W. Klau Rumen Andonov Sparsifying Distance Matrices for Protein-Protein Structure Alignments. 211-214 2011 CTW http://ctw2011.dia.uniroma3.it/ctw_proceedings.pdf#page=223 conf/colognetwente/2011 db/conf/colognetwente/colognetwente2011.html#MucherinoWKA11