Empirical Model of Radio Wave Propagation in the Presence of Vegetation inside Greenhouses Using Regularized Regressions. - Dora Cama-Pinto; Miguel Damas; Juan Antonio Holgado Terriza; Francisco Manuel Arrabal-Campos; Francisco Gómez-Mula; Juan Antonio Martínez Martínez-Lao; Alejandro Cama-Pinto (Sensors, 2020)