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Link to original content: https://dblp.dagstuhl.de/rec/journals/csur/Ullman95.xml
Jeffrey D. Ullman The Role of Theory Today. 43-44 1995 27 ACM Comput. Surv. 1 db/journals/csur/csur27.html#Ullman95 https://doi.org/10.1145/214037.214089