recommendation on standardized surface resistance for hourly calculation of reference ETo by the FAO56 Penman-Monteith method von Allen, R.G, Pruitt, W.O, Wright, J.L, Howell, T.A, Ventura, F, Snyder, R, Itenfisu, D, Steduto, P, Berengena, J, Yrisarry, J.B

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