Kristen Nygaard. Basic concepts in object oriented programming. SIGPLAN Notices, 21(10):128-132, 1986. [doi]
@article{Nygaard86-0, title = {Basic concepts in object oriented programming}, author = {Kristen Nygaard}, year = {1986}, doi = {10.1145/323648.323751}, url = {https://doi.org/10.1145/323648.323751}, researchr = {https://researchr.org/publication/Nygaard86-0}, cites = {0}, citedby = {0}, journal = {SIGPLAN Notices}, volume = {21}, number = {10}, pages = {128-132}, }