Sosa López, A. A., Flores Balderas, A., Trejo Durán, M. and Alvarado Méndez, E. (2016) “Three-Dimensional Volumetric Coordinate System Through the use of Light-Emitting-Diodes (LEDs) and Microcontrollers”, Acta Universitaria, 26, pp. 35–38. doi: 10.15174/au.2016.931.