diff --git a/doc/images/bipartite_partitions.eps b/doc/images/bipartite_partitions.eps
new file mode 100644
--- /dev/null
+++ b/doc/images/bipartite_partitions.eps
@@ -0,0 +1,113 @@
+%!PS-Adobe-2.0 EPSF-2.0
+%%Creator: LEMON, graphToEps()
+%%CreationDate: Tue Nov 15 16:51:43 2005
+%%BoundingBox: 0 0 596 842
+%%DocumentPaperSizes: a4
+%%EndComments
+/lb { setlinewidth setrgbcolor newpath moveto
+      4 2 roll 1 index 1 index curveto stroke } bind def
+/l { setlinewidth setrgbcolor newpath moveto lineto stroke } bind def
+/c { newpath dup 3 index add 2 index moveto 0 360 arc closepath } bind def
+/sq { newpath 2 index 1 index add 2 index 2 index add moveto
+      2 index 1 index sub 2 index 2 index add lineto
+      2 index 1 index sub 2 index 2 index sub lineto
+      2 index 1 index add 2 index 2 index sub lineto
+      closepath pop pop pop} bind def
+/di { newpath 2 index 1 index add 2 index moveto
+      2 index             2 index 2 index add lineto
+      2 index 1 index sub 2 index             lineto
+      2 index             2 index 2 index sub lineto
+      closepath pop pop pop} bind def
+/nc { 0 0 0 setrgbcolor 5 index 5 index 5 index c fill
+     setrgbcolor 1.1 div c fill
+   } bind def
+/nsq { 0 0 0 setrgbcolor 5 index 5 index 5 index sq fill
+     setrgbcolor 1.1 div sq fill
+   } bind def
+/ndi { 0 0 0 setrgbcolor 5 index 5 index 5 index di fill
+     setrgbcolor 1.1 div di fill
+   } bind def
+/arrl 1 def
+/arrw 0.3 def
+/lrl { 2 index mul exch 2 index mul exch rlineto pop} bind def
+/arr { setrgbcolor /y1 exch def /x1 exch def /dy exch def /dx exch def
+       /w exch def /len exch def
+       newpath x1 dy w 2 div mul add y1 dx w 2 div mul sub moveto
+       len w sub arrl sub dx dy lrl
+       arrw dy dx neg lrl
+       dx arrl w add mul dy w 2 div arrw add mul sub
+       dy arrl w add mul dx w 2 div arrw add mul add rlineto
+       dx arrl w add mul neg dy w 2 div arrw add mul sub
+       dy arrl w add mul neg dx w 2 div arrw add mul add rlineto
+       arrw dy dx neg lrl
+       len w sub arrl sub neg dx dy lrl
+       closepath fill } bind def
+/cshow { 2 index 2 index moveto dup stringwidth pop
+         neg 2 div fosi .35 mul neg rmoveto show pop pop} def
+
+gsave
+71.6378 15 translate
+0.389093 dup scale
+90 rotate
+1197.47 -613.138 translate
+%Edges:
+gsave
+513.857 -446.322 296.569 -487.43 79.2808 -528.539 0 0 0 2 lb
+513.857 -446.322 575.52 -315.655 637.183 -184.989 0 0 0 2 lb
+393.468 566.711 494.771 434.577 596.074 302.442 0 0 0 2 lb
+393.468 566.711 155.625 579.925 -82.2171 593.138 0 0 0 2 lb
+393.468 566.711 251.056 450.726 108.644 334.741 0 0 0 2 lb
+869.153 52.8539 732.613 177.648 596.074 302.442 0 0 0 2 lb
+869.153 52.8539 753.168 -66.0676 637.183 -184.989 0 0 0 2 lb
+-82.2171 593.138 -91.0261 346.487 -99.8351 99.8351 0 0 0 2 lb
+-663.61 546.157 -753.168 394.936 -842.726 243.715 0 0 0 2 lb
+-663.61 546.157 -574.052 437.513 -484.494 328.869 0 0 0 2 lb
+-1077.63 161.498 -960.178 202.606 -842.726 243.715 0 0 0 2 lb
+-1077.63 161.498 -968.987 66.0674 -860.344 -29.3633 0 0 0 2 lb
+-1177.47 -234.906 -1029.18 -381.722 -880.898 -528.539 0 0 0 2 lb
+-1177.47 -234.906 -1018.91 -132.135 -860.344 -29.3633 0 0 0 2 lb
+-880.898 -528.539 -744.359 -387.595 -607.82 -246.651 0 0 0 2 lb
+-499.175 -499.175 -355.295 -475.685 -211.415 -452.194 0 0 0 2 lb
+-499.175 -499.175 -553.498 -372.913 -607.82 -246.651 0 0 0 2 lb
+-499.175 -499.175 -386.587 -315.087 -274 -131 0 0 0 2 lb
+79.2808 -528.539 -66.0671 -490.366 -211.415 -452.194 0 0 0 2 lb
+637.183 -184.989 421.363 -253.993 205.543 -322.996 0 0 0 2 lb
+205.543 -322.996 162.966 -226.097 120.389 -129.198 0 0 0 2 lb
+399.34 88.0898 259.865 -20.5541 120.389 -129.198 0 0 0 2 lb
+399.34 88.0898 253.992 211.415 108.644 334.741 0 0 0 2 lb
+-842.726 243.715 -471.281 171.775 -99.8351 99.8351 0 0 0 2 lb
+-842.726 243.715 -558.363 56.3575 -274 -131 0 0 0 2 lb
+-860.344 -29.3633 -734.082 -138.007 -607.82 -246.651 0 0 0 2 lb
+-211.415 -452.194 -45.513 -290.696 120.389 -129.198 0 0 0 2 lb
+-99.8351 99.8351 4.40445 217.288 108.644 334.741 0 0 0 2 lb
+-99.8351 99.8351 -292.165 214.352 -484.494 328.869 0 0 0 2 lb
+120.389 -129.198 -76.8055 -130.099 -274 -131 0 0 0 2 lb
+grestore
+%Nodes:
+gsave
+-274 -131 20 1 0 0 nc
+-607.82 -246.651 20 1 0 0 nc
+-484.494 328.869 20 0 0 1 nc
+108.644 334.741 20 0 0 1 nc
+120.389 -129.198 20 0 0 1 nc
+-99.8351 99.8351 20 1 0 0 nc
+-211.415 -452.194 20 1 0 0 nc
+-860.344 -29.3633 20 0 0 1 nc
+-842.726 243.715 20 0 0 1 nc
+399.34 88.0898 20 1 0 0 nc
+205.543 -322.996 20 1 0 0 nc
+637.183 -184.989 20 0 0 1 nc
+79.2808 -528.539 20 0 0 1 nc
+-499.175 -499.175 20 0 0 1 nc
+-880.898 -528.539 20 0 0 1 nc
+-1177.47 -234.906 20 1 0 0 nc
+-1077.63 161.498 20 1 0 0 nc
+-663.61 546.157 20 1 0 0 nc
+-82.2171 593.138 20 0 0 1 nc
+596.074 302.442 20 0 0 1 nc
+869.153 52.8539 20 1 0 0 nc
+393.468 566.711 20 1 0 0 nc
+513.857 -446.322 20 1 0 0 nc
+grestore
+grestore
+showpage