Department of Applied Mathematics in Agricultural Engineering Technical University of Madrid (UPM), E.T.S.I. Agrónomos Avd de la Conplutense, Madrid, 28042 Spain
USDA-ARS-BA-NRI-EMSL, 173 Powder Mill Road, BARC-EAST, Beltsviile, MD 20705 United States
Department of Applied Mathematics in Agricultural Engineering Technical University of Madrid (UPM), E.T.S.I. Agrónomos Avd de la Conplutense, Madrid, 28042 Spain