E. X. Albán G., D. A. Estrella M., and J. Arauz, “Development of an application of Location Based Services for a cellular type network Global System for Mobile (GSM)”., ACI Av. Cienc. Ing. (Quito), vol. 3, no. 1, Jun. 2011, doi: 10.18272/aci.v3i1.61.