From 6d45bbc88bd58d7fc8a4ff7ec70bd2f23cb67aa1 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Wed, 11 Dec 2019 16:42:13 +0100
Subject: Add a +proj=xyzgridshift method to perform geocentric translation by
 grid. Used for French NTF to RGF93 transformation using gr3df97a.tif grid

---
 docs/source/references.bib | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'docs/source/references.bib')

diff --git a/docs/source/references.bib b/docs/source/references.bib
index 0668e10d..8e527ea1 100644
--- a/docs/source/references.bib
+++ b/docs/source/references.bib
@@ -230,6 +230,15 @@
   Doi                      = {10.2312/PE/PG/PG2012short/005-010}
 }
 
+@TechReport{NTF_88,
+  Title                    = {Grille de parametres de transformation de coordonnees - GR3DF97A - Notice d'utilisation},
+  Author                   = {IGN},
+  Institution              = {Service de Geodesie et Nivellement, Institut Geographique National},
+  Year                     = {1997},
+
+  Url                      = {https://geodesie.ign.fr/contenu/fichiers/documentation/algorithmes/notice/NTG_88.pdf}
+}
+
 @TechReport{ONeilLaubscher1976,
   Title                    = {Extended Studies of a Quadrilateralized Spherical Cube Earth Data Base},
   Author                   = {E. M. O'Neill and R. E. Laubscher},
-- 
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