1. 1. Hevko B. M., Pylypetsʹ M. I., Vasylʹkiv V. V., Radyk D. L. Tekhnolohichni osnovy formotvorennya riznoprofilʹnykh hvyntovykh zahotovok. Ternopilʹ: Vyd-vo TDTU im. I. Pulyuya, 2009. 457 p., ISBN 966-305-014-4. [In Ukrainian].
2. 2. Rogatinskiy R., Hevko I., Gypka A., Garmatyk O., Martsenko S. Feasibility study of the method choice of manufacturing screw cleaning elements with the development and use of software. Acta Technologica Agriculturae. Nitra, Slovaca Universitas Agriculturae Nitriae, 2017. No. 2. P. 36-41.
3. 3. Feng Guang- liang1, Bai Yin-shan. Some Moulding Ways of Spiral Vane. Coal Mine Machinery. 2006. Vol. 27. No. 9.
4. 4. Hevko Iv. B., Dyachun A. Y., Gypka A. B. Investigating the force parameters of forming the screw purifying elements. ISB-INMA TEC. Agricultural and mechanical engineering. International symposium. 29-31 October 2015. Bucharest, 2015. P. 191-196. ISSN 2344 - 4118.
5. 5. Gevko B. M., Rogatynskiy R. M. Vintovyye podayushchiye mekhanizmy sel'skokhozyaystvennykh mashin. L'vov: Vyshcha shkola; izd-vo pri L'vov. un-te, 1989. 176 p. [In Russian].