diff --git a/lemon/network_simplex.h b/lemon/network_simplex.h
--- a/lemon/network_simplex.h
+++ b/lemon/network_simplex.h
@@ -2,7 +2,7 @@
  *
  * This file is a part of LEMON, a generic C++ optimization library.
  *
- * Copyright (C) 2003-2009
+ * Copyright (C) 2003-2011
  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
  * (Egervary Research Group on Combinatorial Optimization, EGRES).
  *
@@ -95,7 +95,7 @@
       /// infinite upper bound.
       UNBOUNDED
     };
-    
+
     /// \brief Constants for selecting the type of the supply constraints.
     ///
     /// Enum type containing constants for selecting the supply type,
@@ -113,7 +113,7 @@
       /// supply/demand constraints in the definition of the problem.
       LEQ
     };
-    
+
     /// \brief Constants for selecting the pivot rule.
     ///
     /// Enum type containing constants for selecting the pivot rule for
@@ -156,7 +156,7 @@
       /// candidate list and extends this list in every iteration.
       ALTERING_LIST
     };
-    
+
   private:
 
     TEMPLATE_DIGRAPH_TYPEDEFS(GR);
@@ -223,7 +223,7 @@
     Value delta;
 
   public:
-  
+
     /// \brief Constant for infinite upper bounds (capacities).
     ///
     /// Constant for infinite upper bounds (capacities).
@@ -644,7 +644,7 @@
         "The flow type of NetworkSimplex must be signed");
       LEMON_ASSERT(std::numeric_limits<Cost>::is_signed,
         "The cost type of NetworkSimplex must be signed");
-        
+
       // Resize vectors
       _node_num = countNodes(_graph);
       _arc_num = countArcs(_graph);
@@ -684,7 +684,7 @@
         _target[i] = _node_id[_graph.target(a)];
         if ((i += k) >= _arc_num) i = (i % k) + 1;
       }
-      
+
       // Initialize maps
       for (int i = 0; i != _node_num; ++i) {
         _supply[i] = 0;
@@ -809,7 +809,7 @@
       _supply[_node_id[t]] = -k;
       return *this;
     }
-    
+
     /// \brief Set the type of the supply constraints.
     ///
     /// This function sets the type of the supply/demand constraints.
@@ -835,7 +835,7 @@
     ///
     /// This function runs the algorithm.
     /// The paramters can be specified using functions \ref lowerMap(),
-    /// \ref upperMap(), \ref costMap(), \ref supplyMap(), \ref stSupply(), 
+    /// \ref upperMap(), \ref costMap(), \ref supplyMap(), \ref stSupply(),
     /// \ref supplyType().
     /// For example,
     /// \code
@@ -1054,7 +1054,7 @@
         _flow[i] = 0;
         _state[i] = STATE_LOWER;
       }
-      
+
       // Set data for the artificial root node
       _root = _node_num;
       _parent[_root] = -1;
@@ -1228,7 +1228,7 @@
       // Search the cycle along the path form the second node to the root
       for (int u = second; u != join; u = _parent[u]) {
         e = _pred[u];
-        d = _forward[u] ? 
+        d = _forward[u] ?
           (_cap[e] == INF ? INF : _cap[e] - _flow[e]) : _flow[e];
         if (d <= delta) {
           delta = d;
@@ -1435,7 +1435,7 @@
           updatePotential();
         }
       }
-      
+
       // Check feasibility
       for (int e = _search_arc_num; e != _all_arc_num; ++e) {
         if (_flow[e] != 0) return INFEASIBLE;
@@ -1452,7 +1452,7 @@
           }
         }
       }
-      
+
       // Shift potentials to meet the requirements of the GEQ/LEQ type
       // optimality conditions
       if (_sum_supply == 0) {