M. . Singh, D. . Ethiraj, V. . Indiran, N. D. . Kanase, and P. . Maduraimuthu, “Xanthogranulomatous pyelonephritis with calculus migration into the psoas abscess: an unusual complication”, Autops. Case Rep., vol. 11, p. e2020200, Jan. 2021, doi: 10.4322/acr.2020.200.