Acknowledgement: d*TREK SMV reader credits Pflugrath (1999) and dxtbx

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K5K8jvPPbmCrbqnWkddTuB

reader/SMV.cpp

@@ -108,6 +108,8 @@ std::vector<std::string> Words(const std::map<std::string, std::string> &kv, con
     return out;
 }
 
+// Following Pflugrath (1999) Acta Cryst. D55, 1718-1725 (d*TREK) and dxtbx, Parkhurst et al. (2014)
+// J. Appl. Cryst. 47, 1459-1465.
 // d*TREK, as Rigaku's CrystalClear writes it for the Saturn and R-AXIS families. Read the way dxtbx's
 // FormatSMVRigakuSaturn reads it: the image directions are <det>DETECTOR_VECTORS combined by
 // <det>SPATIAL_DISTORTION_VECTORS, the point of normal incidence (pixels) and the pixel size (mm) come