2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/18528Magnetization and resistance measurements were carried out on carbon-based multiwall nanotubes. Both magnetization and resistance data can be consistently explained in terms of bulk superconductivity above 400 K although we cannot completely rule out other possible explanations to the data.5 pages, 4 figures, the extended version was accepted for publication in Phil. Mag. B on Oct. 18Superconductivitytext