Per Brinch Hansen. The nucleus of a multiprogramming system. Communications of the ACM, 13(4):238-241, 1970. [doi]
@article{Hansen70, title = {The nucleus of a multiprogramming system}, author = {Per Brinch Hansen}, year = {1970}, doi = {10.1145/362258.362278}, url = {http://doi.acm.org/10.1145/362258.362278}, researchr = {https://researchr.org/publication/Hansen70}, cites = {0}, citedby = {0}, journal = {Communications of the ACM}, volume = {13}, number = {4}, pages = {238-241}, }