diff --git a/owlps-positioner/fbcm.cc b/owlps-positioner/fbcm.cc
index 8531163..c1dff3f 100644
--- a/owlps-positioner/fbcm.cc
+++ b/owlps-positioner/fbcm.cc
@@ -31,7 +31,7 @@ Result FBCM::compute(const Request &_request)
 float FBCM::estimate_distance(const Measurement &measurement)
 {
   double constant_term = make_constant_term(measurement) ;
-  const float &average_dbm = measurement.get_average_dbm() ;
+  float average_dbm = measurement.get_average_dbm() ;
   const CapturePoint *cp = measurement.get_cp() ;
   return pow(10, (constant_term - average_dbm) /
              (10 * friis_index(cp))) ;
diff --git a/owlps-positioner/frbhmbasic.cc b/owlps-positioner/frbhmbasic.cc
index 3da861c..44869e6 100644
--- a/owlps-positioner/frbhmbasic.cc
+++ b/owlps-positioner/frbhmbasic.cc
@@ -39,7 +39,7 @@ Result FRBHMBasic::compute(const Request &_request)
 float FRBHMBasic::estimate_distance(const Measurement &measurement)
 {
   double constant_term = make_constant_term(measurement) ;
-  const float &average_dbm = measurement.get_average_dbm() ;
+  float average_dbm = measurement.get_average_dbm() ;
   const CapturePoint *cp = measurement.get_cp() ;
   return pow(10, (constant_term - average_dbm) /
              (10 * friis_index(cp))) ;
diff --git a/owlps-positioner/interlinknetworks.cc b/owlps-positioner/interlinknetworks.cc
index 4dc889b..db1ae78 100644
--- a/owlps-positioner/interlinknetworks.cc
+++ b/owlps-positioner/interlinknetworks.cc
@@ -20,6 +20,6 @@ float InterlinkNetworks::
 estimate_distance(const Measurement &measurement)
 {
   double constant_term = make_constant_term(measurement) ;
-  const float &average_dbm = measurement.get_average_dbm() ;
+  float average_dbm = measurement.get_average_dbm() ;
   return pow(10, (constant_term - average_dbm) / 35) ;
 }
diff --git a/owlps-positioner/measurement.hh b/owlps-positioner/measurement.hh
index 58c0970..86c7d29 100644
--- a/owlps-positioner/measurement.hh
+++ b/owlps-positioner/measurement.hh
@@ -117,11 +117,11 @@ public:
   /// Computes the distance to another Measurement's SS average
   float ss_square_distance(const Measurement &source) const ;
   /// Computes the distance to another SS value (in dBm)
-  float ss_square_distance(const float &ss_dbm) const ;
+  float ss_square_distance(const float ss_dbm) const ;
   /// Computes the distance to another Measurement's variance (mW)
   float variance_mw_square_distance(const Measurement &source) const ;
   /// Computes the distance to another variance value in mW
-  float variance_mw_square_distance(const float &var) const ;
+  float variance_mw_square_distance(const float var) const ;
   //@}
 
   /** @name Operators */
@@ -204,7 +204,7 @@ ss_square_distance(const Measurement &source) const
 }
 
 
-inline float Measurement::ss_square_distance(const float &ss_dbm) const
+inline float Measurement::ss_square_distance(const float ss_dbm) const
 {
   return ((ss_dbm - average_dbm) * (ss_dbm - average_dbm)) ;
 }
@@ -218,7 +218,7 @@ variance_mw_square_distance(const Measurement &source) const
 
 
 inline float Measurement::
-variance_mw_square_distance(const float &var) const
+variance_mw_square_distance(const float var) const
 {
   return ((var - variance_mw) * (var - variance_mw)) ;
 }
diff --git a/owlps-positioner/mobile.hh b/owlps-positioner/mobile.hh
index 1e7f310..7ef1444 100644
--- a/owlps-positioner/mobile.hh
+++ b/owlps-positioner/mobile.hh
@@ -28,8 +28,8 @@ class Mobile: public WifiDevice
 public:
   Mobile(const std::string &_ip_addr = "",
          const std::string &_mac_addr = "",
-         const float &_antenna_gain = MOBILE_DEFAULT_ANTENNA_GAIN,
-         const float &_trx_power = WIFIDEVICE_DEFAULT_TRX_POWER):
+         const float _antenna_gain = MOBILE_DEFAULT_ANTENNA_GAIN,
+         const float _trx_power = WIFIDEVICE_DEFAULT_TRX_POWER):
     WifiDevice(_ip_addr, _mac_addr, _antenna_gain, _trx_power) {}
 
   Mobile(const WifiDevice &wd):
diff --git a/owlps-positioner/posutil.cc b/owlps-positioner/posutil.cc
index 79755cb..74efcdd 100644
--- a/owlps-positioner/posutil.cc
+++ b/owlps-positioner/posutil.cc
@@ -29,13 +29,13 @@ using namespace std ;
 /* *** Maths *** */
 
 
-double PosUtil::deg2rad(const double &degrees)
+double PosUtil::deg2rad(const double degrees)
 {
   return degrees / (180.0 / M_PI) ;
 }
 
 
-double PosUtil::rad2deg(const double &radians)
+double PosUtil::rad2deg(const double radians)
 {
   return radians * (180.0 / M_PI) ;
 }
diff --git a/owlps-positioner/posutil.hh b/owlps-positioner/posutil.hh
index 4bc66cb..2438b53 100644
--- a/owlps-positioner/posutil.hh
+++ b/owlps-positioner/posutil.hh
@@ -37,9 +37,9 @@ public:
   /** @name Maths */
   //@{
   /// Returns the radian value of `degrees`
-  static double deg2rad(const double &degrees) ;
+  static double deg2rad(const double degrees) ;
   /// Returns the degree value of `radians`
-  static double rad2deg(const double &radians) ;
+  static double rad2deg(const double radians) ;
   /// Checks if `value` is in the interval [center-width;center+width]
   static bool is_in_interval(const float center, const float bound,
                              const float value) ;
diff --git a/owlps-positioner/referencepoint.cc b/owlps-positioner/referencepoint.cc
index b898295..08138d6 100644
--- a/owlps-positioner/referencepoint.cc
+++ b/owlps-positioner/referencepoint.cc
@@ -262,10 +262,10 @@ friis_index_for_cp(const string &cp_mac) const
  * @returns The sum of all Friis indexes for the CapturePoint.
  * @returns 0 if the CP is unknown at this ReferencePoint.
  */
-float ReferencePoint::friis_indexes_for_cp(
-  const CapturePoint &cp,
-  const double &const_term,
-  int &nb_indexes) const
+float ReferencePoint::
+friis_indexes_for_cp(const CapturePoint &cp,
+                     const double const_term,
+                     int &nb_indexes) const
 {
   nb_indexes = 0 ;
   double friis_idx_sum = 0 ;
diff --git a/owlps-positioner/referencepoint.hh b/owlps-positioner/referencepoint.hh
index 1361b63..4d1a26e 100644
--- a/owlps-positioner/referencepoint.hh
+++ b/owlps-positioner/referencepoint.hh
@@ -45,9 +45,9 @@ protected:
   //@}
 
 public:
-  ReferencePoint(const float &_x = 0,
-                 const float &_y = 0,
-                 const float &_z = 0): Point3D(_x, _y, _z) {}
+  ReferencePoint(const float _x = 0,
+                 const float _y = 0,
+                 const float _z = 0): Point3D(_x, _y, _z) {}
 
   ReferencePoint(const Point3D &p): Point3D(p) {}
 
@@ -86,9 +86,9 @@ public:
   /// Computes the Friis index for the given CapturePoint
   float friis_index_for_cp(const std::string &cp_mac) const ;
   /// Computes the Friis indexes sum for the given CapturePoint
-  float friis_indexes_for_cp(
-    const CapturePoint &cp, const double &const_term,
-    int &nb_indexes) const ;
+  float friis_indexes_for_cp(const CapturePoint &cp,
+                             const double const_term,
+                             int &nb_indexes) const ;
   /// Computes the Friis index for the given CapturePoint and packet ID
   float friis_index_for_cp(
     const std::string &cp_mac, const pkt_id_t pkt_id) const ;
diff --git a/owlps-positioner/waypoint.cc b/owlps-positioner/waypoint.cc
index 681231f..d8ed1e2 100644
--- a/owlps-positioner/waypoint.cc
+++ b/owlps-positioner/waypoint.cc
@@ -32,8 +32,8 @@ using namespace std ;
  * @param _z Z coordinate.
  */
 Waypoint::Waypoint(Building *const _b,
-                   const float &_x, const float &_y, const float &_z
-                  ): Point3D(_x, _y, _z)
+                   const float _x, const float _y, const float _z):
+  Point3D(_x, _y, _z)
 {
   if (_b != NULL)
     buildings.insert(_b) ;
diff --git a/owlps-positioner/waypoint.hh b/owlps-positioner/waypoint.hh
index 5b29d07..5004637 100644
--- a/owlps-positioner/waypoint.hh
+++ b/owlps-positioner/waypoint.hh
@@ -37,8 +37,8 @@ protected:
   std::unordered_set<Building*> buildings ;
 
 public:
-  Waypoint(Building *const _b = NULL, const float &_x = 0,
-           const float &_y = 0, const float &_z = 0) ;
+  Waypoint(Building *const _b = NULL, const float _x = 0,
+           const float _y = 0, const float _z = 0) ;
 
   Waypoint(Building *const _b, const Point3D &p) ;