The statement that magnetic lines of force cannot intersect is a fundamental axiom of classical electromagnetism, representing a well-established physical principle that requires no citation.
The retrieved papers pertain to specialized modern topics such as surface-enhanced Raman spectroscopy, quantum biology, gravitational waves, particle dynamics near magnetic null lines, and solid-state physics. None of the papers directly address or evaluate the foundational physics rule that magnetic field lines never intersect. Therefore, the claim is treated as common knowledge in physics, and no citation is needed from the retrieved text.