Index: /qipapers.bib
===================================================================
--- /qipapers.bib	(revision 232)
+++ /qipapers.bib	(revision 233)
@@ -18683,2 +18683,10 @@
   author = {Aaarts, S. van and Batenburg, K.J. and Rossell, M.D. and Erni, R. and Tendeloo, G. van}
 }
+@article{jensen_helium,
+  year = {2006},
+  title = {A comparison of liquid nitrogen and liquid helium as cryogens for electron cryotomography},
+  pages = {231-240},
+  journal = {Journal of Structural Biology},
+  volume = {153},
+  author = {Iancu, C.V. and Wright, E.R. and Heymann, J.B. and Jensen, G.J.}
+}