diff --git a/constants/null_doi.php b/constants/null_doi.php
index e09b9444bb..8be018735c 100644
--- a/constants/null_doi.php
+++ b/constants/null_doi.php
@@ -51,6 +51,7 @@
 '10.14429/dsj.53.2282',
 '10.14429/dsj.60.344',
 '10.14496/dia.7104343513.14',
+'10.1489/1544-581X(2004)072<0169:LOLSTP>2.0.CO;2',
 '10.15026/57434',
 '10.1515/crll.1878.84.242',
 '10.1525/fq.1955.9.3.04a00070',
@@ -286,4 +287,9 @@
 '10.7314/apjcp.2013.14.7.4283',
 '10.7731/KIFSE.2015.29.2.039',
 '10.8080/4020100059499',
+'10.12989/was.2018.27.2.137',
+'10.1101/gr.082701.108',
+'10.1261/rna.2338706',
+'10.1261/rna.2340906',
+'10.15581/017.23.67-84',
 );