Jorn Andersen, Trygve Reenskaug. Operations on sets in an OODB. OOPS Messenger, 2(4):26-39, 1991.
@article{AndersenR91, title = {Operations on sets in an OODB}, author = {Jorn Andersen and Trygve Reenskaug}, year = {1991}, researchr = {https://researchr.org/publication/AndersenR91}, cites = {0}, citedby = {0}, journal = {OOPS Messenger}, volume = {2}, number = {4}, pages = {26-39}, }