Add citations for lu98 and lu99 to introduction MD discussion.

These papers are probably the earliest examples of molecular dynamics
simulations of velocity-clamp unfolding.

diff --git a/src/introduction/main.tex b/src/introduction/main.tex
index 0c13d4c701cd790d6644755df8aa64d6e6066df4..0323e4fef09efb242912d480d31e85bc70100f3c 100644 (file)
--- a/src/introduction/main.tex
+++ b/src/introduction/main.tex
@@ -131,7 +131,8 @@ resolution over experimental timescales.  Even with significant
 computing resources, comparing molecular dynamics results with
 experimental data remains elusive.  For example, experimental pulling
 speeds are on the order of \bareU{$\mu$m/s}, while simulation pulling
-speeds are on the order of \bareU{m/s}\citep{zhao06,berkemeier11}.
+speeds are on the order of
+\bareU{m/s}\citep{lu98,lu99,zhao06,berkemeier11}.
 
 % why AFM & what an AFM is
 Single molecule techniques for manipulating biopolymers include