PENG, Hui. 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://scholarpublishing.org/journals/index.php/EJAS/article/view/10747. Acesso em: 30 may. 2026.