diff --git a/ihm/help/reference b/ihm/help/reference
index d44fa92..d30c4b0 100644
--- a/ihm/help/reference
+++ b/ihm/help/reference
@@ -3,8 +3,8 @@ Some resources about coordinates transformation :
 	<li>C.T. Russell, (1971) "Geophysical Coordinate Transformations", Cosmic. Electrodyn. 2, 184-196</li>
 	<li>M.A. Hapgood, (1992) "Space Physics Coordinate Transformations: A User Guide", Planet. Space Sci. 40, 711-717 (but see correction note in Hapgood (1997))</li>
 	<li>M.A. Hapgood, (1997) "Corrigendum to Space Physics Coordinate Transformations: A User Guide", Planet. Space Sci. 45, 1047.</li>
-	<li> References for Coordinate Transformations <a href="http://www.mssl.ucl.ac.uk/grid/iau/extra/local_copy/SP_coords/refs.htm" target="_blank">http://www.mssl.ucl.ac.uk/grid/iau/extra/local_copy/SP_coords/refs.htm</a></li>
-	<li>M.Fraenz and D.Harper, Heliospheric Coordinate Systems, Plan. Space Sci., 50, 217-233 (Feb 2002) - Associated site: <a href="http://www.mps.mpg.de/homes/fraenz/systems/" target="_blank">http://www.mps.mpg.de/homes/fraenz/systems/</a></li>
+	<li><a href="help/refs_mssl.htm" target="_blank">References for Coordinate Transformations</a></li>
+	<li>M.Fraenz and D.Harper, Heliospheric Coordinate Systems, Plan. Space Sci., 50, 217-233 (Feb 2002) - <a href="help/refs_mps.htm" target="_blank">Associated site</a></li>
 	<li><a href="http://cdpp.irap.omp.eu/index.php/services/scientific-librairies/maglib" target="_blank">MAGLIB</a></li>
 	<li><a href="http://cdpp.irap.omp.eu/index.php/services/scientific-librairies/rocotlib" target="_blanck">ROCOTLIB</a></li>
 </ul>
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