1. S. H. HUMPHRIES, Compensation for backlash and alignment errors of a numerically controlled machine tool by digital computer techniques. Project thesis 1966. (M.Sc. Course in Numerical Control of Machine Tools and Production Processes, University of Aston in Birmingham.)
2. YA. S. BROVMAN, Electrical drive of metal cutting machine tools with servo speed control. Electro-Engineering Research Institute at Novosibirsk from Elektrichestvo, (8), 13–18, 1964.
3. Method for compensating variation of milli radius in program controlled milling machines;KEPPIK;Engineering Cybernetics (English translation of Tekhnicheskaya Kidernetika),1963
4. Costs cut on path control;HATSCHEK;American Machine Metalworking Manufacturing,1965
5. V. F. BOBROWICZ, Why post-processors? A.S.T.M.E. 32nd Annual Meeting collected papers, Vol. 64, Book 1, Paper 582, 23, 1964.