1. Associate Professor, ETSI Montes, Technical Univ. of Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain.
2. Associate Professor, Faculty of Forestry Sciences, Santiago del Estero Univ., Av. Gral. Manuel Belgrano Sur 1912 4200 Santiago del Estero, Argentina.
3. Coordinator of Online Studies, Faculty of Science and Arts, Catholic Univ. of Avila, Calle Canteros, s/n 05005, Ávila, Spain; formerly, Senior Researcher, ETSI Montes, Technical Univ. of Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain (corresponding author).