diff --git a/eo/src/ga/eoBitOp.h b/eo/src/ga/eoBitOp.h
index 5051199a..e0df842d 100644
--- a/eo/src/ga/eoBitOp.h
+++ b/eo/src/ga/eoBitOp.h
@@ -1,3 +1,50 @@
+// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
+
+//-----------------------------------------------------------------------------
+// eoBitOp.h
+// (c) GeNeura Team, 2000 - EEAAX 2000 - Maarten Keijzer 2000
+/* 
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+    Contact: todos@geneura.ugr.es, http://geneura.ugr.es
+             Marc.Schoenauer@polytechnique.fr
+             mak@dhi.dk
+ */
+//-----------------------------------------------------------------------------
+// MS 17/10/2000
+// Added the uniform crossover - which, for some reasons, had dissapeared!
+// Added the eoDetBitFlip, which flips exactly num_bit bits
+// Aslo added the above standard header
+
+// I also want to start the discussion about the "gene" crossover.
+// I think the word "gene" is not appropriate: if real numbers are coded in 
+// binary format, then a "gene" is a bit, and that's it
+// if you want to exchange real number per se, then use real coding
+//
+// Because all crossover operators here except that Gene crossover 
+// ARE generic, i.e. appky to any vertor of something.
+
+// Note that for mutations, if instead of       
+//             chrom[i] = (chrom[i]) ? false : true;
+// we were calling something like
+//             specific_mutate(chrom[i])
+// all mutation would also be generic ... except those eoBinNext and eoBinPrev
+
+// If anybody reads this and want to change that (I'm also testing to see
+// if someone ever reads the headers :-), drop me a mail
+// Marc (Marc.Schoenauer@polytechnique.fr)
 //-----------------------------------------------------------------------------
 // eoBitOp.h
 //-----------------------------------------------------------------------------
@@ -12,7 +59,8 @@
 #include <eoInit.h>       // eoMonOp
 #include <ga/eoBin.h>
 
-/** eoBinBitFlip --> changes a bit 
+
+/** eoBinBitFlip --> changes 1 bit  
 \class eoBinBitFlip eoBitOp.h ga/eoBitOp.h
 \ingroup bitstring
 */
@@ -35,6 +83,42 @@ template<class Chrom> class eoBinBitFlip: public eoMonOp<Chrom>
     }
 };
 
+/** eoDetBitFlip --> changes exactly k bits  
+\class eoDetBitFlip eoBitOp.h ga/eoBitOp.h
+\ingroup bitstring
+*/
+
+template<class Chrom> class eoDetBitFlip: public eoMonOp<Chrom>
+{
+ public:
+  /**
+   * (Default) Constructor.
+   * @param _num_bit The number of bits to change
+   * default is one - equivalent to eoBinBitFlip then
+   */
+  eoDetBitFlip(const unsigned& _num_bit = 1): num_bit(_num_bit) {}
+
+  /// The class name.
+  string className() const { return "eoDetBitFlip"; }
+  
+  /**
+   * Change num_bit bits.
+   * @param chrom The cromosome which one bit is going to be changed.
+   */
+  void operator()(Chrom& chrom) 
+    {
+      chrom.invalidate();
+      // does not check for duplicate: if someone volunteers ....
+      for (unsigned k=0; k<num_bit; k++)
+	{
+	  unsigned i = rng.random(chrom.size());
+	  chrom[i] = (chrom[i]) ? false : true;
+	}
+    }
+ private:
+  unsigned num_bit;
+};
+
 
 /** eoBinMutation --> classical mutation 
 \class eoBinMutation eoBitOp.h ga/eoBitOp.h
@@ -172,7 +256,7 @@ template<class Chrom> class eoBinPrev: public eoMonOp<Chrom>
 };
   
 
-/** eoBinCrossover --> classic 2-point crossover 
+/** eoBinCrossover --> classic 1-point crossover 
 \class eoBinCrossover eoBitOp.h ga/eoBitOp.h
 \ingroup bitstring
 */
@@ -184,7 +268,7 @@ template<class Chrom> class eoBinCrossover: public eoQuadraticOp<Chrom>
   string className() const { return "eoBinCrossover"; }
 
   /**
-   * 2-point crossover for binary chromosomes.
+   * 1-point crossover for binary chromosomes.
    * @param chrom1 The first chromosome.
    * @param chrom2 The first chromosome.
    */
@@ -204,6 +288,55 @@ template<class Chrom> class eoBinCrossover: public eoQuadraticOp<Chrom>
 };
   
 
+/** eoBinUxOver --> classic Uniform crossover 
+\class eoBinNxOver eoBitOp.h ga/eoBitOp.h
+\ingroup bitstring
+*/
+
+template<class Chrom> class eoBinUxOver: public eoQuadraticOp<Chrom>
+{
+ public:
+  /// (Default) Constructor.
+  eoBinUxOver(const float& _preference = 0.5): preference(_preference)
+    { 
+      if ( (_preference <= 0.0) || (_preference >= 1.0) )
+	runtime_error("UxOver --> invalid preference");
+    }
+  /// The class name.
+  string className() const { return "eoBinUxOver"; }
+
+  /**
+   * Uniform crossover for binary chromosomes.
+   * @param chrom1 The first chromosome.
+   * @param chrom2 The first chromosome.
+   *    @runtime_error if sizes don't match
+   */
+  void operator()(Chrom& chrom1, Chrom& chrom2) 
+    {
+      if ( chrom1.size() != chrom2.size()) 
+	    runtime_error("UxOver --> chromosomes sizes don't match" ); 
+      bool changed = false;
+      for (unsigned int i=0; i<chrom1.size(); i++)
+	{
+	  if (rng.flip(preference))
+	    {
+	      bool tmp = chrom1[i];
+	      chrom1[i]=chrom2[i];
+	      chrom2[i] = tmp;
+	      changed = true;
+	    }
+	}
+      if (changed)
+	  {
+	    chrom1.invalidate();
+	    chrom2.invalidate();
+	  }
+    }
+    private:
+      float preference;
+};
+  
+
 /** eoBinNxOver --> n-point crossover 
 \class eoBinNxOver eoBitOp.h ga/eoBitOp.h
 \ingroup bitstring
@@ -212,7 +345,7 @@ template<class Chrom> class eoBinCrossover: public eoQuadraticOp<Chrom>
 template<class Chrom> class eoBinNxOver: public eoQuadraticOp<Chrom>
 {
  public:
-  /// (Defualt) Constructor.
+  /// (Default) Constructor.
   eoBinNxOver(const unsigned& _num_points = 2): num_points(_num_points)
     { 
       if (num_points < 1)