Collapse in f(R) gravity and the method of R matching Sandip Chowdhury, Kunal Pal, Kuntal Pal and Tapobrata Sarkar Eur. Phys. J. C, 80 9 (2020) 902 Published online: 29 September 2020 DOI: 10.1140/epjc/s10052-020-08459-w