Jorn Andersen, Trygve Reenskaug. Operations on sets in an OODB. OOPS Messenger, 4(1):12-25, 1993.
@article{AndersenR93, title = {Operations on sets in an OODB}, author = {Jorn Andersen and Trygve Reenskaug}, year = {1993}, researchr = {https://researchr.org/publication/AndersenR93}, cites = {0}, citedby = {0}, journal = {OOPS Messenger}, volume = {4}, number = {1}, pages = {12-25}, }