HAUG, E. G. Measurements of the Planck Length from a Ball Clock without Knowledge of Newton’s Gravitational Constant G or the Planck Constant. European Journal of Applied Physics, [S. l.], v. 3, n. 6, p. 15–20, 2021. DOI: 10.24018/ejphysics.2021.3.6.133. Disponível em: https://www.ej-physics.org/index.php/ejphysics/article/view/133. Acesso em: 28 jan. 2023.