1. Dovramadjiev, T.: Advanced Technologies in Design, p. 228. Technical University of Varna, Bulgaria (2017). ISBN: 978-954-20-0771-5
2. Sandeep, T.R.: Computer Integrated Manufacturing. ACE, Bangalore.
http://www.alphace.ac.in/downloads/notes/me/10me61.pdf
3. Dassault Systems SolidWorks: 3D CAD Design Software.
https://www.solidworks.com/
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5. Smirnov, A.A.: Three-dimensional geometric modeling [Trehmernoe geometricheskoe modelirovanie], pp. 1–40. MGTU, Moscow (2008)