Mathematical Modeling and Ergonomic Study of a Pencil Through Numerical Simulation for Support of the Graphological Presumptive Diagnosis. - Luis González-Delgado; Julio Verdugo-Cabrera; Luis Serpa-Andrade; Isaac Ojeda-Zamalloa; Vladimir Robles-Bykbaev; Fernando Pesántez-Avilés; Olena Naidiuk; Ninfa González-Delgado (AHFE (6), 2017)