diff -r 48e17328c155 -r f63ba40a60f4 doc/references.bib
--- a/doc/references.bib	Sun Jan 29 22:33:14 2012 +0100
+++ b/doc/references.bib	Mon Jan 30 23:24:14 2012 +0100
@@ -4,8 +4,7 @@
   key =          {LEMON},
   title =        {{LEMON} -- {L}ibrary for {E}fficient {M}odeling and
                   {O}ptimization in {N}etworks},
-  howpublished = {\url{http://lemon.cs.elte.hu/}},
-  year =         2009
+  howpublished = {\url{http://lemon.cs.elte.hu/}}
 }
 
 @misc{egres,
@@ -213,6 +212,16 @@
   pages =        {309-311}
 }
 
+@article{hartmann93finding,
+  author =       {Mark Hartmann and James B. Orlin},
+  title =        {Finding minimum cost to time ratio cycles with small
+                  integral transit times},
+  journal =      {Networks},
+  year =         1993,
+  volume =       23,
+  pages =        {567-574}
+}
+
 @article{dasdan98minmeancycle,
   author =       {Ali Dasdan and Rajesh K. Gupta},
   title =        {Faster Maximum and Minimum Mean Cycle Alogrithms for
@@ -225,6 +234,17 @@
   pages =        {889-899}
 }
 
+@article{dasdan04experimental,
+  author =       {Ali Dasdan},
+  title =        {Experimental analysis of the fastest optimum cycle
+                  ratio and mean algorithms},
+  journal =      {ACM Trans. Des. Autom. Electron. Syst.},
+  year =         2004,
+  volume =       9,
+  issue =        4,
+  pages =        {385-418}
+} 
+
 
 %%%%% Minimum cost flow algorithms %%%%%