AHMAD, M. Reciprocal Symmetry and its Relation to Einstein’s Postulate, Lorentz Transformation and Discreteness. Journal of Scientific Research, [S. l.], v. 1, n. 2, p. 270–274, 2009. DOI: 10.3329/jsr.v1i2.1875. Disponível em: https://banglajol.info/index.php/JSR/article/view/1875. Acesso em: 19 may. 2022.