Update reference to Pulkkinen et al

Author: pulkkins

doc/source/references.bib

@@ -80,7 +80,9 @@ @ARTICLE{PCH2018
   AUTHOR = "S. Pulkkinen and V. Chandrasekar and A.-M. Harri",
   TITLE = "Nowcasting of Precipitation in the High-Resolution {D}allas-{F}ort {W}orth ({DFW}) Urban Radar Remote Sensing Network",
   JOURNAL = "IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing",
-  NOTE = "accepted, to appear",
+  VOLUME = 11,
+  NUMBER = 8,
+  PAGES = "2773--2787",
   YEAR = 2018,
   DOI = "10.1109/JSTARS.2018.2840491"
 }