2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/17903A recent paper [Physical Review {\bf B 64} 014508 (2001)] claims to present an exact method to extract the critical current density J$_C$ from the M-H hysteresis curve. We show that this claim appears unjustified.4 pages of TeX fileSuperconductivityComment on ``Critical current density from magnetization hysteresis data using the critical-state model''text