diff --git a/owlps-positioning/Makefile b/owlps-positioning/Makefile
index 3076032..1afa759 100644
--- a/owlps-positioning/Makefile
+++ b/owlps-positioning/Makefile
@@ -84,7 +84,7 @@ mobile.o: wifidevice.o
 measurement.o: accesspoint.o
 request.o: timestamp.o measurement.o
 calibrationrequest.o: request.o referencepoint.o direction.o
-inputcsv.o: inputmedium.o request.o stock.o
+inputcsv.o: inputmedium.o request.o calibrationrequest.o stock.o
 inputlogcsv.o: inputlogmedium.hh request.o
 input.o: posexcept.o
 
diff --git a/owlps-positioning/TODO b/owlps-positioning/TODO
index b40f8f9..7558f41 100644
--- a/owlps-positioning/TODO
+++ b/owlps-positioning/TODO
@@ -1,8 +1,4 @@
 
-- InputCSV
-   ° Différencier une requête normale d'une requête de calibration, en
-   utilisant les champs de direction.
-
 - Input
    ° Finir le test unitaire.
 
diff --git a/owlps-positioning/input.cc b/owlps-positioning/input.cc
index d5b7bf7..29163e0 100644
--- a/owlps-positioning/input.cc
+++ b/owlps-positioning/input.cc
@@ -1,9 +1,10 @@
 #include "input.hh"
 #include "inputcsv.hh"
 #include "inputlogcsv.hh"
-#include "request.hh"
+#include "calibrationrequest.hh"
 #include "configuration.hh"
 #include "posexcept.hh"
+#include "stock.hh"
 
 using namespace std ;
 
@@ -88,7 +89,8 @@ const Request& Input::get_next_request() const
 {
   if (! eof())
     {
-      medium->get_next_request() ;
+      const Request &request = medium->get_next_request() ;
+      add_request_to_stock(request) ;
       log_current_request() ;
     }
 
@@ -104,6 +106,23 @@ bool Input::eof() const
 }
 
 
+void Input::add_request_to_stock(const Request &request) const
+{
+  // For the moment we add only the CalibrationRequests to the Stock
+  const CalibrationRequest *calibration_request =
+    dynamic_cast<const CalibrationRequest*>(&request) ;
+  if (calibration_request == NULL)
+    return ;
+
+  // Add request to the Stock
+  const CalibrationRequest &stock_calibration_request =
+    Stock::find_create_calibration_request(*calibration_request) ;
+
+  // Add the request to the request list of its reference point
+  stock_calibration_request.reference_point_backward_link() ;
+}
+
+
 void Input::log_current_request() const
 {
   for (vector<InputLogMedium*>::const_iterator i = log_media.begin() ;
diff --git a/owlps-positioning/input.hh b/owlps-positioning/input.hh
index a8c0b1c..15dd790 100644
--- a/owlps-positioning/input.hh
+++ b/owlps-positioning/input.hh
@@ -19,6 +19,7 @@ protected:
   void initialise_input_medium(void) ;
   void initialise_log_media(void) ;
   void initialise_log_csv(void) ;
+  void add_request_to_stock(const Request &request) const ;
   void log_current_request(void) const ;
 
 public:
diff --git a/owlps-positioning/inputcsv.cc b/owlps-positioning/inputcsv.cc
index 2f09146..da0aef3 100644
--- a/owlps-positioning/inputcsv.cc
+++ b/owlps-positioning/inputcsv.cc
@@ -2,6 +2,7 @@
 #include "posutil.hh"
 #include "posexcept.hh"
 #include "stock.hh"
+#include "calibrationrequest.hh"
 
 #include <stdint.h>
 
@@ -271,7 +272,16 @@ const Request& InputCSV::get_next_request()
   read_next_line() ;
 
   if (is_calibration_request)
-    current_request_to_calibration_request() ;
+    {
+      current_request_to_calibration_request() ;
+      CalibrationRequest *request =
+        static_cast<CalibrationRequest*>(current_request) ;
+      request->set_direction(direction) ;
+      ReferencePoint position(pos) ;
+      const ReferencePoint &reference_point =
+        Stock::find_create_reference_point(position) ;
+      request->set_reference_point(&reference_point) ;
+    }
 
   return *current_request ;
 }
diff --git a/owlps-positioning/stock.cc b/owlps-positioning/stock.cc
index 10c48b2..45566f3 100644
--- a/owlps-positioning/stock.cc
+++ b/owlps-positioning/stock.cc
@@ -3,8 +3,15 @@
 
 using namespace std ;
 using std::tr1::unordered_map ;
+using std::tr1::unordered_set ;
 
 
+/// Hash function, required to put ReferencePoint in a set
+size_t hash_value(const ReferencePoint &object)
+{
+  return boost::hash_value(static_cast<string>(object)) ;
+}
+
 
 /* *** Attribute definitions *** */
 
@@ -12,9 +19,13 @@ unordered_map<string, Mobile> Stock::mobiles ;
 
 unordered_map<string, AccessPoint> Stock::aps ;
 
+unordered_set<ReferencePoint> Stock::reference_points ;
+
+unordered_set<CalibrationRequest> Stock::calibration_requests ;
 
 
-/* *** Read accessors *** */
+
+/* *** Accessors *** */
 
 
 /**
@@ -50,12 +61,30 @@ const AccessPoint& Stock::get_ap(const string &mac)
 }
 
 
+const ReferencePoint& Stock::
+find_create_reference_point(const ReferencePoint &point)
+{
+  // unordered_set::insert() do all the job: see the documentation at
+  // http://www.boost.org/doc/libs/1_41_0/doc/html/boost/unordered_set.html
+  pair<unordered_set<ReferencePoint>::iterator, bool> ret =
+    reference_points.insert(point) ;
+  return *ret.first ;
+}
 
-/* *** Write accessors *** */
+
+const CalibrationRequest& Stock::
+find_create_calibration_request(const CalibrationRequest &request)
+{
+  pair<unordered_set<CalibrationRequest>::iterator, bool> ret =
+    calibration_requests.insert(request) ;
+  return *ret.first ;
+}
 
 
 void Stock::clear()
 {
   mobiles.clear() ;
   aps.clear() ;
+  reference_points.clear() ;
+  calibration_requests.clear() ;
 }
diff --git a/owlps-positioning/stock.hh b/owlps-positioning/stock.hh
index 5a8a1c8..3c14690 100644
--- a/owlps-positioning/stock.hh
+++ b/owlps-positioning/stock.hh
@@ -3,8 +3,11 @@
 
 #include "mobile.hh"
 #include "accesspoint.hh"
+#include "referencepoint.hh"
+#include "calibrationrequest.hh"
 
 #include <boost/tr1/unordered_map.hpp>
+#include <boost/tr1/unordered_set.hpp>
 
 /// Storage class
 class Stock
@@ -16,6 +19,12 @@ private:
   /// List of known AccessPoint
   static std::tr1::unordered_map<std::string, AccessPoint> aps ;
 
+  /// List of known ReferencePoint
+  static std::tr1::unordered_set<ReferencePoint> reference_points ;
+
+  /// List of known CalibrationRequest
+  static std::tr1::unordered_set<CalibrationRequest> calibration_requests ;
+
 public:
   /// Read the Mobile corresponding to a given MAC address
   static const Mobile& get_mobile(const std::string &mac) ;
@@ -27,13 +36,21 @@ public:
   /// Get a reference to the AccessPoint corresponding to a given MAC address
   static AccessPoint& getw_ap(const std::string &mac) ;
 
+  /// Look for a ReferencePoint and create it if it does not exist
+  static const ReferencePoint&
+  find_create_reference_point(const ReferencePoint &point) ;
+
+  /// Get a reference to a CalibrationRequest
+  static const CalibrationRequest&
+  find_create_calibration_request(const CalibrationRequest &request) ;
+
   /// Deletes all elements in all attributes
   static void clear(void) ;
 } ;
 
 
 
-/* *** Read accessors *** */
+/* *** Accessors *** */
 
 
 /**