Michael M. David. Advanced Capabilities of the Outer Join. SIGMOD Record, 21(1):65-70, 1992. [doi]
@article{David92-1, title = {Advanced Capabilities of the Outer Join}, author = {Michael M. David}, year = {1992}, doi = {10.1145/130868.133746}, url = {http://doi.acm.org/10.1145/130868.133746}, researchr = {https://researchr.org/publication/David92-1}, cites = {0}, citedby = {0}, journal = {SIGMOD Record}, volume = {21}, number = {1}, pages = {65-70}, }