SIGMOD RECORD
journal25722
E155056
US
0163-5808
English
Rivista
ACM / Association for Computing Machinery:1515 Broadway, 17th Floor:New York, NY 10036:(212)869-7440, EMAIL: acmhelp@hq.acm.org, INTERNET: http://www.acm.org, Fax: (212)944-1318
1976
can
cannot
false