Index: /qipapers.bib
===================================================================
--- /qipapers.bib	(revision 40)
+++ /qipapers.bib	(revision 41)
@@ -12641,2 +12641,11 @@
   pages = {1148-1157}
 }
+@article{Castaldo2008,
+  author = {Castaldo, V. and  Hagen, C.W. Rieger, B. and Kruit, P.},
+  title = {Sputtering limits versus signal-to-noise limits in the observation of {Sn} balls in a {Ga+} microscope},
+  journal = {Journal of Vacuum Science and Technology B},
+  year = {2008},
+  volume = {26},
+  number = {6},
+  pages = {2107-2115}
+}