v1.3.2.3 DOC: ref to Lobligeois PhD added in PE_Oudin doc

DESCRIPTION

 Package: airGR
 Type: Package
 Title: Suite of GR Hydrological Models for Precipitation-Runoff Modelling
-Version: 1.3.2.2
+Version: 1.3.2.3
 Date: 2019-05-22
 Authors@R: c(
   person("Laurent", "Coron", role = c("aut", "trl"), comment = c(ORCID = "0000-0002-1503-6204")),

NEWS.rmd

@@ -14,7 +14,7 @@ output:
 
 
 
-### 1.3.2.2 Release Notes (2019-05-22)
+### 1.3.2.3 Release Notes (2019-05-22)
 
 
 #### New features

man/PE_Oudin.Rd

@@ -37,6 +37,7 @@ PE_Oudin(JD, Temp, LatRad, Lat, LatUnit, TimeStepIn = "daily", TimeStepOut = "da
 
 \description{
 Function which computes daily PE using the formula from Oudin et al. (2005).
+From daily to hourly time steps, the PE is disaggregated as explained by Lobligeois (2014; p. 78)
 }
 
 \details{
@@ -63,5 +64,8 @@ Oudin, L., F. Hervieu, C. Michel, C. Perrin, V. Andréassian, F. Anctil and C. L
   Which potential evapotranspiration input for a lumped rainfall-runoff model?: 
   Part 2-Towards a simple and efficient potential evapotranspiration model for rainfall-runoff modelling. 
   Journal of Hydrology, 303(1-4), 290-306. doi:10.1016/j.jhydrol.2004.08.026.
+Lobligeois, F. (2014).
+  Mieux connaitre la distribution spatiale des pluies améliore-t-il la modélisation des crues ? Diagnostic sur 181 bassins versants français.
+  PhD thesis (in French), AgroParisTech (Paris), IRSTEA (Antony), France.
 }