diff --git a/src/Controller/ReferenceController.php b/src/Controller/ReferenceController.php
index 60d1f7d..f0bd8e3 100644
--- a/src/Controller/ReferenceController.php
+++ b/src/Controller/ReferenceController.php
@@ -146,6 +146,9 @@ class ReferenceController extends AbstractController
     public static function retrieveWSC($ref): Reference
     {
         $r = self::$emi->getRepository(Reference::class)->findBy(['type' => $ref->getType(), 'ndx' => $ref->getNdx()]);
+        if (!$r) {
+            return new Reference();
+        }
         return $r[0];
     }
 
@@ -159,6 +162,9 @@ class ReferenceController extends AbstractController
     public static function retrieveWLC($ref): Reference
     {
         $r = self::$emi->getRepository(Reference::class)->findBy(['type' => $ref->getType(), 'ndx' => $ref->getNdx()]);
+        if (!$r) {
+            return new Reference();
+        }
         return $r[0];
     }
 
@@ -172,12 +178,54 @@ class ReferenceController extends AbstractController
     public static function retrieveWCF($ref): Reference
     {
         $r = self::$emi->getRepository(Reference::class)->findBy(['type' => $ref->getType(), 'ndx' => $ref->getNdx()]);
+        if (!$r) {
+            return new Reference();
+        }
         return $r[0];
     }
 
     public static function retrieveLBC($ref): Reference
     {
         $r = self::$emi->getRepository(Reference::class)->findBy(['type' => 'lbc', 'ndx' => $ref->getNdx()]);
+        if (!$r) {
+            return new Reference();
+        }
+        return $r[0];
+    }
+
+    public static function retrieveAGC($ref): Reference
+    {
+        $r = self::$emi->getRepository(Reference::class)->findBy(['type' => 'agc', 'ndx' => $ref->getNdx()]);
+        if (!$r) {
+            return new Reference();
+        }
+        return $r[0];
+    }
+
+    public static function retrieve1HC($ref): Reference
+    {
+        $r = self::$emi->getRepository(Reference::class)->findBy(['type' => '1hc', 'ndx' => $ref->getNdx()]);
+        if (!$r) {
+            return new Reference();
+        }
+        return $r[0];
+    }
+
+    public static function retrieve2HC($ref): Reference
+    {
+        $r = self::$emi->getRepository(Reference::class)->findBy(['type' => '2hc', 'ndx' => $ref->getNdx()]);
+        if (!$r) {
+            return new Reference();
+        }
+        return $r[0];
+    }
+
+    public static function retrieveSD($ref): Reference
+    {
+        $r = self::$emi->getRepository(Reference::class)->findBy(['type' => 'sd', 'ndx' => $ref->getNdx()]);
+        if (!$r) {
+            return new Reference();
+        }
         return $r[0];
     }
 
@@ -186,4 +234,14 @@ class ReferenceController extends AbstractController
         $notes = self::$emi->getRepository(Note::class)->findBy(['user' => $user], ['date' => 'DESC']);
         return $notes;
     }
+
+    #[Route('/reference/{type}', name: 'app_reference_by_type', methods: ['GET'])]
+    public function retrieveReferenceByType(string $type, EntityManagerInterface $emi): Response
+    {
+        $res = new Response();
+        $data = $emi->getRepository(Reference::class)->findByType($type);
+
+        $res->setContent(json_encode($data));
+        return $res;
+    }
 }