diff -r ac2348e62010 -r e0bd7c5ec864 pnas/pnas.tex
--- a/pnas/pnas.tex	Tue Dec 07 15:09:29 2010 -0600
+++ b/pnas/pnas.tex	Mon Dec 27 11:29:54 2010 -0800
@@ -498,7 +498,8 @@
 Thus we can have the simplicity of strict associativity in exchange for more morphisms.
 We wish to imitate this strategy in higher categories.
 Because we are mainly interested in the case of pivotal $n$-categories, we replace the intervals $[0,r]$ not with
-a product of $k$ intervals (c.f. \cite{ulrike-tillmann-2008,0909.2212}) but rather with any $k$-ball, that is, 
+a product of $k$ intervals (c.f.\ \cite{0909.2212}) but rather with any $k$-ball, that is, 
+% \cite{ulrike-tillmann-2008,0909.2212}
 any $k$-manifold which is homeomorphic
 to the standard $k$-ball $B^k$.
 
@@ -1293,9 +1294,9 @@
 \newblock Princeton University Press, Princeton, N.J., 1978.
 \newblock \mathscinet{MR505692} \googlebooks{e2rYkg9lGnsC}.
 
-\bibitem{ulrike-tillmann-2008}
-Ulrike Tillmann, 2008.
-\newblock personal communication.
+%\bibitem{ulrike-tillmann-2008}
+%Ulrike Tillmann, 2008.
+%\newblock personal communication.
 
 \bibitem{0909.2212}
 Ronald {Brown}.