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ACM}, VOLUME = {38}, NUMBER = {1}, PAGES = {74-103}, YEAR = {1991, January}, PUBLISHER = {ACM Press}, ADDRESS = {New York}, } @article{Willard/91, AUTHOR = {Willard, D.E.}, TITLE = {Optimal sample cost residues for differential database batch query problems}, JOURNAL = {J. ACM}, VOLUME = {38}, NUMBER = {1}, PAGES = {104-119}, YEAR = {1991, January}, PUBLISHER = {ACM Press}, ADDRESS = {New York}, } @article{Sagiv/91, AUTHOR = {Sagiv, Y.}, TITLE = {Evaluation of queries in independent database schemes}, JOURNAL = {J. ACM}, VOLUME = {38}, NUMBER = {1}, PAGES = {120-161}, YEAR = {1991, January}, PUBLISHER = {ACM Press}, ADDRESS = {New York}, } @article{Frederickson/91, AUTHOR = {Frederickson, G.N.}, TITLE = {Planar graph decomposition and all pairs shortest paths}, JOURNAL = {J. 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