diff -r e344f0887c59 -r d59484d5fc1f doc/groups.dox
--- a/doc/groups.dox	Thu Sep 13 12:23:46 2012 +0200
+++ b/doc/groups.dox	Wed Nov 07 17:39:39 2012 +0100
@@ -407,9 +407,19 @@
    strongly polynomial \ref klein67primal, \ref goldberg89cyclecanceling.
 
 In general, \ref NetworkSimplex and \ref CostScaling are the most efficient
-implementations, but the other two algorithms could be faster in special cases.
+implementations.
+\ref NetworkSimplex is usually the fastest on relatively small graphs (up to
+several thousands of nodes) and on dense graphs, while \ref CostScaling is
+typically more efficient on large graphs (e.g. hundreds of thousands of
+nodes or above), especially if they are sparse.
+However, other algorithms could be faster in special cases.
 For example, if the total supply and/or capacities are rather small,
 \ref CapacityScaling is usually the fastest algorithm (without effective scaling).
+
+These classes are intended to be used with integer-valued input data
+(capacities, supply values, and costs), except for \ref CapacityScaling,
+which is capable of handling real-valued arc costs (other numerical
+data are required to be integer).
 */
 
 /**
@@ -448,7 +458,7 @@
 \brief Algorithms for finding minimum mean cycles.
 
 This group contains the algorithms for finding minimum mean cycles
-\ref clrs01algorithms, \ref amo93networkflows.
+\ref amo93networkflows, \ref karp78characterization.
 
 The \e minimum \e mean \e cycle \e problem is to find a directed cycle
 of minimum mean length (cost) in a digraph.
@@ -464,12 +474,11 @@
 function.
 
 LEMON contains three algorithms for solving the minimum mean cycle problem:
-- \ref KarpMmc Karp's original algorithm \ref amo93networkflows,
-  \ref dasdan98minmeancycle.
+- \ref KarpMmc Karp's original algorithm \ref karp78characterization.
 - \ref HartmannOrlinMmc Hartmann-Orlin's algorithm, which is an improved
-  version of Karp's algorithm \ref dasdan98minmeancycle.
+  version of Karp's algorithm \ref hartmann93finding.
 - \ref HowardMmc Howard's policy iteration algorithm
-  \ref dasdan98minmeancycle.
+  \ref dasdan98minmeancycle, \ref dasdan04experimental.
 
 In practice, the \ref HowardMmc "Howard" algorithm turned out to be by far the
 most efficient one, though the best known theoretical bound on its running