| Working notes, 15.12.1965(?) The first version of the future EPSILON (then still SYGMA) language. Both manuscript and typewritten texts
Working notes, 15.01.1966(?)Manuscript remarks on the first version of the language
Working notes, 15.01.1966(?)The intermediate version of the language. The typewritten text corrected by hand
Working notes, 15.02.1966(?)The second version of the language. The typewritten text
Working notes, 15.02.1966(?)Manuscript remarks on the second version of the language
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