PENG, H. Maxwell Equations derived from (Coulomb’ Law + velocity), Maxwell-type Gravity derived from (Newton’s Law + velocity), Spin-Electromagnetics derived from (Coulomb’ Law + spin), Spin-Gravity derived from (Newton’s Law + spin) --- Duality, Symmetry, and Uni. European Journal of Applied Sciences, [S. l.], v. 13, n. 04, p. 123–173, 2025. DOI: 10.14738/aivp.1304.19150. Disponível em: https://journals.scholarpublishing.org/index.php/AIVP/article/view/19150. Acesso em: 5 dec. 2025.