• On the data structure and linkage problems in NC machine tool languagesTamm, Boris, inform.Numerical control programming languages : proceedings of the 1st International IFIP/IFAC PROLAMAT Conference, Rome, 19691970 / p. 342-349 : ill https://www.amazon.com/Numerical-Control-Programming-Languages-Proceedings/dp/0720420393 https://www.ester.ee/record=b1656174*est