imporve documentation

ostap/fitting/signals.py

@@ -914,13 +914,18 @@ def sigmaR ( self ) :
 models.append ( Apollonios2_pdf )    
 # =============================================================================
 ## @class BifurcatedGauss_pdf
+#  Aka a split normal distribution 
+#  @see https://en.wikipedia.org/wiki/Split_normal_distribution
 #  simple wrapper over bifurcated-gaussian
 #  @see RooGaussian
 #  @author Vanya BELYAEV [email protected]
 #  @date 2011-07-25
 class BifurcatedGauss_pdf(PEAK) :
     """Bifurcated Gauss function
     
+    Aka a split normal distribution 
+    - see https://en.wikipedia.org/wiki/Split_normal_distribution
+
     f(x; mu, sigma_l, sigma_r ) ~ exp ( -0.5 * dx^2 )
     
     with

source/include/Ostap/Peaks.h

@@ -26,7 +26,9 @@ namespace Ostap
   {
     // ========================================================================
     /** @class BifurcatedGauss
-     *  simple representation of bifurcated gaussian function
+     *  Aka a split normal distribution 
+     *  @see https://en.wikipedia.org/wiki/Split_normal_distribution
+     *  simple representation of bifurcated gaussian function/
      *  @author Vanya Belyaev [email protected]
      *  @date 2011-04-19
      */