Delgado Alvarado, Gustavo, and Bertram Nagel. “A Simple Experiment to Evaluate the Uncertainty Following the Guide GUM ISO 1995 and Using MAPLE Symbolic Computation 11.0”. Universitas (León) , vol. 2, no. 1, July 2008, pp. 19-26, doi:10.5377/universitas.v2i1.1639.