TY  - RPRT
TI  - Cooperative answers in database systems
AU  - Gaasterland, Terry
AU  - Godfrey, Parke
AU  - Minker, Jack
AU  - Novik, Lev
PY  - 1993
UR  - https://ntrs.nasa.gov/citations/19930022964
ID  - 19930022964
ER  -