Silva, O. H. M. da, and C. E. Laburú. “An Alternative Time Marker for the Study of the Uniform and Uniformly Accelerated Movements”. Semina: Ciências Exatas E Tecnológicas, vol. 24, no. 1, July 2004, pp. 59-68, doi:10.5433/1679-0375.2003v24n1p59.