diff --git a/Modules/Filtering/ImageNoise/include/otbFrostImageFilter.h b/Modules/Filtering/ImageNoise/include/otbFrostImageFilter.h
index 15de095c98f0a4eaeea2f660055ca1c511151827..0e54d13b0916e92aa8d5670aa10fcec8a57c1497 100644
--- a/Modules/Filtering/ImageNoise/include/otbFrostImageFilter.h
+++ b/Modules/Filtering/ImageNoise/include/otbFrostImageFilter.h
@@ -35,6 +35,8 @@ namespace otb
  * A = k*Ci*Ci  with Ci = VAR[I]/ (E[I]*E[I])
  * The final result is normalized by the sum of the kernel coefficients.
  *
+ * (http://www.isprs.org/proceedings/XXXV/congress/comm2/papers/110.pdf)
+ * 
  * \ingroup OTBImageNoise
  */
 
diff --git a/Modules/Filtering/ImageNoise/include/otbGammaMAPImageFilter.h b/Modules/Filtering/ImageNoise/include/otbGammaMAPImageFilter.h
index 39e4c891c29eb141274f8335a4013d19f555fa72..a3fcfd4dcd74a7723d9f90d4188d87d247f1dd4b 100644
--- a/Modules/Filtering/ImageNoise/include/otbGammaMAPImageFilter.h
+++ b/Modules/Filtering/ImageNoise/include/otbGammaMAPImageFilter.h
@@ -31,7 +31,8 @@ namespace otb
  * This class implements Gamma MAP filter for despeckleing of SAR
  * images. 
  *
- *
+ * (http://www.isprs.org/proceedings/XXXV/congress/comm2/papers/110.pdf)
+ * 
  * \ingroup OTBImageNoise
  */
 
diff --git a/Modules/Filtering/ImageNoise/include/otbKuanImageFilter.h b/Modules/Filtering/ImageNoise/include/otbKuanImageFilter.h
index 874467549cfd92d3048ef6db4a8f3b1b1c70392a..9008cce9b2ab75e5b63d5b37d48f92fee515d405 100644
--- a/Modules/Filtering/ImageNoise/include/otbKuanImageFilter.h
+++ b/Modules/Filtering/ImageNoise/include/otbKuanImageFilter.h
@@ -31,7 +31,8 @@ namespace otb
  * This class implements Kuan filter for despeckleing of SAR
  * images. 
  *
- *
+ * (http://www.isprs.org/proceedings/XXXV/congress/comm2/papers/110.pdf)
+ * 
  * \ingroup OTBImageNoise
  */
 
diff --git a/Modules/Filtering/ImageNoise/include/otbLeeImageFilter.h b/Modules/Filtering/ImageNoise/include/otbLeeImageFilter.h
index 12bb6fb1e2b3d256eb93da29f0a7f3401222808c..b6e6f6963f81b1f6670a9111d68a3fc6aa088b40 100644
--- a/Modules/Filtering/ImageNoise/include/otbLeeImageFilter.h
+++ b/Modules/Filtering/ImageNoise/include/otbLeeImageFilter.h
@@ -30,12 +30,14 @@ namespace otb
  *
  * This class implements Lee's filter for despeckleing of SAR
  * images. The estimated reflectivity R is computed as follows:
-
-R=I*W+E[I]*(1-W), where
-W=1-Cu*Cu/(Ci*Ci)
-Cu = 1/sqrt(nb of look)
-Ci = sqrt(VAR[I])/E[I]
-
+ * 
+ * R=I*W+E[I]*(1-W), where
+ * W=1-Cu*Cu/(Ci*Ci)
+ * Cu = 1/sqrt(nb of look)
+ * Ci = sqrt(VAR[I])/E[I]
+ * 
+ * (http://www.isprs.org/proceedings/XXXV/congress/comm2/papers/110.pdf)
+ * 
  *
  *
  * \ingroup OTBImageNoise