diff --git a/packages/CLPBN/horus/ConstraintTree.cpp b/packages/CLPBN/horus/ConstraintTree.cpp
index ac6f705e1..8b0e7799d 100644
--- a/packages/CLPBN/horus/ConstraintTree.cpp
+++ b/packages/CLPBN/horus/ConstraintTree.cpp
@@ -1033,7 +1033,7 @@ ConstraintTree::swapLogVar (LogVar X)
 {
   size_t pos = Util::indexOf (logVars_, X);
   assert (pos != logVars_.size());
-  const CTNodes& nodes = getNodesAtLevel (pos);
+  CTNodes nodes = getNodesAtLevel (pos);
   for (CTNodes::const_iterator nodeIt = nodes.begin();
        nodeIt != nodes.end(); ++ nodeIt) {
     CTChilds childsCopy = (*nodeIt)->childs();
diff --git a/packages/CLPBN/horus/CountingBp.cpp b/packages/CLPBN/horus/CountingBp.cpp
index 0357939f1..870d27edf 100644
--- a/packages/CLPBN/horus/CountingBp.cpp
+++ b/packages/CLPBN/horus/CountingBp.cpp
@@ -186,7 +186,7 @@ CountingBp::createGroups (void)
     size_t prevVarGroupsSize = varGroups.size();
     varGroups.clear();
     for (size_t i = 0; i < varNodes.size(); i++) {
-      const VarSignature& signature = getSignature (varNodes[i]);
+      VarSignature signature = getSignature (varNodes[i]);
       VarSignMap::iterator it = varGroups.find (signature);
       if (it == varGroups.end()) {
         it = varGroups.insert (std::make_pair (
@@ -207,7 +207,7 @@ CountingBp::createGroups (void)
     facGroups.clear();
     // set a new color to the factors with the same signature
     for (size_t i = 0; i < facNodes.size(); i++) {
-      const FacSignature& signature = getSignature (facNodes[i]);
+      FacSignature signature = getSignature (facNodes[i]);
       FacSignMap::iterator it = facGroups.find (signature);
       if (it == facGroups.end()) {
         it = facGroups.insert (std::make_pair (
@@ -270,8 +270,8 @@ CountingBp::createClusters (
 VarSignature
 CountingBp::getSignature (const VarNode* varNode)
 {
-  const FacNodes& neighs = varNode->neighbors();
   VarSignature sign;
+  const FacNodes& neighs = varNode->neighbors();
   sign.reserve (neighs.size() + 1);
   for (size_t i = 0; i < neighs.size(); i++) {
     sign.push_back (std::make_pair (
@@ -288,8 +288,8 @@ CountingBp::getSignature (const VarNode* varNode)
 FacSignature
 CountingBp::getSignature (const FacNode* facNode)
 {
-  const VarNodes& neighs = facNode->neighbors();
   FacSignature sign;
+  const VarNodes& neighs = facNode->neighbors();
   sign.reserve (neighs.size() + 1);
   for (size_t i = 0; i < neighs.size(); i++) {
     sign.push_back (getColor (neighs[i]));
diff --git a/packages/CLPBN/horus/HorusYap.cpp b/packages/CLPBN/horus/HorusYap.cpp
index 3bc8a0724..5a527addb 100644
--- a/packages/CLPBN/horus/HorusYap.cpp
+++ b/packages/CLPBN/horus/HorusYap.cpp
@@ -44,7 +44,7 @@ createLiftedNetwork (void)
   while (parfactorList != YAP_TermNil()) {
     YAP_Term pfTerm = YAP_HeadOfTerm (parfactorList);
     parfactors.push_back (readParfactor (pfTerm));
-	  parfactorList = YAP_TailOfTerm (parfactorList);
+    parfactorList = YAP_TailOfTerm (parfactorList);
   }
 
   // LiftedUtils::printSymbolDictionary();
@@ -418,7 +418,7 @@ readParfactor (YAP_Term pfTerm)
   }
 
   // read the parameters
-  const Params& params = readParameters (YAP_ArgOfTerm (4, pfTerm));
+  Params params = readParameters (YAP_ArgOfTerm (4, pfTerm));
 
   // read the constraint
   Tuples tuples;