[1] Abhijit Gosavi, Form errors in Precision Metrology: A survey of Measurement Techniques, Quality Engineering 24(3):369-380, July 2012.10.1080/08982112.2011.652583
[2] Diakov D, Kalamanova I et al, Investigation of the form of femoral head articulating surfaces, Proceedings of the symposium “Metrology and Metrology Assurance 2012”, pp. 133-139, Sozopol, Bulgaria, ISSN 1313-9126, September 10-14, 2012 (in Bulg.).
[3] Diakov D, Kalamanova I et al, Method for measuring of sphericity of the femoral head articulating surfaces, Proceedings of the symposium “Metrology and Metrology Assurance 2012”, pp. 140-145, Sozopol, Bulgaria, ISSN 1313-9126, September 10-14, 2012 (in Bulg.).
[7] Jian Mei, Qiang Huang et al, A simple asymptotic search method for estimation of minimum zone sphericity error, AIP Advances 10, 015322 (2020).10.1063/1.5131820
[8] Metrologiyaiizmervatelnatehnika: kniga-spravochnik v tri toma. Tom 2, Pod obsht. rad. na prof. Hr. Radev.-Sofiya: Softreyd, ISBN 978-954-334-093-4, 2010, 987 str.
[9] Prisco, U., Polini, W., Least squares assessment of flatness, cylindricity and sphericity through surface classification based on continuous symmetry of geometric object, Journal of Manufacturing Engineering, Vol.5, Issue 3, pp 153-165, September 2010.
[10] Rossi A, Stefano Chiodi S, Lanzetta M, Minimum centroid neighborhood for minimum zone sphericity, Precision Engineering, 38(2), 337-347, 2014.10.1016/j.precisioneng.2013.11.004
[11] Sukhovilov B. M, Method for Determining the Radius Spherical Surface, Bulletin of the South Ural State University. Ser. Computer Technologies, Automatic control, Radio Electronics, vol.18, no. 2, pp. 164-171, 2018 (in Russ.).10.14529/ctcr180217