diff --git a/examples/config/phase/mechanical/elastic/Hooke_Al.yaml b/examples/config/phase/mechanical/elastic/Hooke_Al.yaml
index 3a6f06a23..583ad183d 100644
--- a/examples/config/phase/mechanical/elastic/Hooke_Al.yaml
+++ b/examples/config/phase/mechanical/elastic/Hooke_Al.yaml
@@ -6,7 +6,7 @@ Al:
       references:
         - J. Vallin et al.,
           Journal of Applied Physics 35(6), 1825-1826, 1964,
-          https://doi.org/10.1063/1.1713749
+          10.1063/1.1713749
       C_11: 107.3e9
       C_12: 60.8e9
       C_44: 28.3e9
diff --git a/examples/config/phase/mechanical/elastic/Hooke_cpTi.yaml b/examples/config/phase/mechanical/elastic/Hooke_cpTi.yaml
index 2c2e3261d..a3ba24d6c 100644
--- a/examples/config/phase/mechanical/elastic/Hooke_cpTi.yaml
+++ b/examples/config/phase/mechanical/elastic/Hooke_cpTi.yaml
@@ -7,7 +7,7 @@ cpTi:
       references:
         - L. Wang et al.,
           Acta Materialia 132, 598-610, 2017,
-          https://doi.org/10.1016/j.actamat.2017.05.015
+          10.1016/j.actamat.2017.05.015
       C_11: 162.4e9
       C_33: 181.6e9
       C_44: 47.2e9