diff --git a/constants/null_bad_doi.php b/constants/null_bad_doi.php
index 3d29bb2abd..ba4b014b81 100644
--- a/constants/null_bad_doi.php
+++ b/constants/null_bad_doi.php
@@ -2781,9 +2781,6 @@
     '10.15438/rr.5.1.7' => true,
     '10.15438/rr.7.1.178' => true,
     '10.15439/2014F368' => true, // page not found
-    '10.15446/ga.v21n1.69792' => true,
-    '10.15446/rsap.v16n1.38665' => true,
-    '10.15446/rsap.v16n2.38983' => true,
     '10.1557/JMR.1998.0166' => true,
     '10.15578/iaj.2.1.2007.27-33' => true,
     '10.1558/cam.v8i1.67' => true, // 404