Peter Wegner. Classification in object-oriented systems. SIGPLAN Notices, 21(10):173-182, 1986. [doi]
@article{Wegner86-0, title = {Classification in object-oriented systems}, author = {Peter Wegner}, year = {1986}, doi = {10.1145/323648.323757}, url = {https://doi.org/10.1145/323648.323757}, researchr = {https://researchr.org/publication/Wegner86-0}, cites = {0}, citedby = {0}, journal = {SIGPLAN Notices}, volume = {21}, number = {10}, pages = {173-182}, }