Index: /qipapers.bib
===================================================================
--- /qipapers.bib	(revision 491)
+++ /qipapers.bib	(revision 492)
@@ -20906,2 +20906,10 @@
   author = {Freitag, J. and Rose, H.}
 }
+@incollection{Nellist2000a,
+  series = {113},
+  year = {2000},
+  title = {The principle and interpretation of annular dark-field Z-contrast imaging},
+  booktitle = {Advances in Imaging and Electron Physics},
+  pages = {147-203},
+  author = {Nellist, P.D. and Pennycook, S.J.}
+}