_:b663966029 . _:b663966029 . _:b663966029 "ISBN:978-0471984931" . _:b663966029 "Structural homology that involves complex structures from which only a fraction of the elements that can be isolated are separately homologous." . _:b663966029 . _:b663966029 "ISBN:0123195837" . _:b663966029 . _:b663966029 . _:b663966029 .