diff --git a/Documentation/ProjectFile/prj/processes/process/PHASE_FIELD/t_energy_split_model.md b/Documentation/ProjectFile/prj/processes/process/PHASE_FIELD/t_energy_split_model.md
index a2f9438f24e2ec95ac5fc8937ead8d5e9eb2d0f7..b75c58041b9df82b20c93ddb6c1363871ac67688 100644
--- a/Documentation/ProjectFile/prj/processes/process/PHASE_FIELD/t_energy_split_model.md
+++ b/Documentation/ProjectFile/prj/processes/process/PHASE_FIELD/t_energy_split_model.md
@@ -2,3 +2,5 @@ Implemented energy split models are:
 - isotropic model \cite bourdin2000numerical, (energy_split_model="Isotropic")
 - volumetric-deviatoric split model \cite amor2009regularized (energy_split_model="VolumetricDeviatoric")
 - effective stress model \cite wu2017unified (energy_split_model="EffectiveStress")
+- orthotropic volumetric-deviatoric model \cite ziaei2022orthogonal, (energy_split_model="OrthoVolDev")
+- orthotropic no-tension model \cite ziaei2022orthogonal, (energy_split_model="OrthoMasonry")
diff --git a/Documentation/bibliography/other.bib b/Documentation/bibliography/other.bib
index 1dfd69f9a12c459eb6af29a83cee5823378928dc..a059c74a3925768c48afe9abda026750f974d9c2 100644
--- a/Documentation/bibliography/other.bib
+++ b/Documentation/bibliography/other.bib
@@ -431,3 +431,14 @@ URL = {https://doi.org/10.1680/geot.2008.58.3.157}
     volume = "19",
     year = "1979"
 }
+
+@misc{ziaei2022orthogonal,
+  doi = {10.48550/ARXIV.2207.01557},
+  url = {https://arxiv.org/abs/2207.01557},
+  author = {Ziaei-Rad, Vahid and Mollaali, Mostafa and Nagel, Thomas and Kolditz, Olaf and Yoshioka, Keita},
+  keywords = {Numerical Analysis (math.NA), FOS: Mathematics, FOS: Mathematics},
+  title = {Orthogonal decomposition of anisotropic constitutive models for the phase field approach to fracture},
+  publisher = {arXiv},
+  year = {2022},
+  copyright = {Creative Commons Attribution Non Commercial No Derivatives 4.0 International}
+}
\ No newline at end of file