The claim that magnetism is a relativistic manifestation of the electrostatic force is a well-established principle of special relativity and electrodynamics that does not require specific paper citations in this context.
The retrieved papers are largely unrelated reviews or specialized studies on machine learning, condensed matter, nanoparticles, and quantum chemistry, none of which directly evaluate or dispute the relativistic derivation of magnetism from electrostatics. This relationship is a textbook consequence of applying Lorentz transformations to electric fields and charges, qualifying it as established scientific knowledge rather than a matter requiring new empirical verification from the provided source list.