1. Antipov, Y.A.: Analytic solution of mixed problems of mathematical physics with a change of boundary conditions over a ring. MTT Mech. Solids 24(3), S. 49–56 (1989)
2. Argatov, I.I., Nazarov, S.A.: The pressure of a narrow ring-shaped punch on an elastic half-space. Pmm J Appl Math Mech 60(5), 799–812 (1996)
3. Argatov, I.I., Nazarov, S.A.: The contact problem for a narrow annular punch. Increasing contact zone. In: Studies in elasticity and plasticity. University Press, St. Petersburg, S. 15–26 (1999)
4. Argatov, I.I., Li, Q., Pohrt, R., Popov, V.L.: Johnson-Kendall-Roberts adhesive contact for a toroidal indenter. Proc. Royal Soc. Lond. Ser. A 472, 20160218 (2016).
https://doi.org/10.1098/rspa.20160218
5. Barber, J.R.: Determining the contact area in elastic indentation problems. J Strain Analysis 9(4), 230–232 (1974)