Add reference to SBR approach

Signed-off-by: Thomas Sedlmayer <tsedlmayer@pmsfit.de>

Author: thomassedlmayer

osi_sensorviewconfiguration.proto

@@ -1096,7 +1096,7 @@ message RaytracerViewConfiguration
         RAYTRACER_FORMAT_OTHER = 1;        
 
         // Raytracer format for Shoot and Bounce Approach (adapted for
-        // electromagnetic wave propagation)
+        // electromagnetic wave propagation) [1]
         //
         // The 64-byte message consists of the fields in the described order,
         // with all values as 32-bit IEEE-754 floats (float32) stored in
@@ -1156,6 +1156,9 @@ message RaytracerViewConfiguration
         //
         //   Offset: 52 (12 bytes)
         //
+        // /par Reference
+        // [1] Brem, R., & Eibert, T. F. (2015, August). A Shooting and Bouncing Ray (SBR) Modeling Framework Involving Dielectrics and Perfect Conductors. IEEE Transactions on Antennas and Propagation, 63(8), 3599-3609. https://doi.org/10.1109/TAP.2015.2438318
+        //
         RAYTRACER_FORMAT_SBR = 2;
         }
 }