diff --git a/codes/quantum/qubits/stabilizer/qldpc/homological/balanced_product/hypergraph_product.yml b/codes/quantum/qubits/stabilizer/qldpc/homological/balanced_product/hypergraph_product.yml
index 522014f48..2885995e0 100644
--- a/codes/quantum/qubits/stabilizer/qldpc/homological/balanced_product/hypergraph_product.yml
+++ b/codes/quantum/qubits/stabilizer/qldpc/homological/balanced_product/hypergraph_product.yml
@@ -9,7 +9,7 @@ logical: qubits
 
 name: 'Hypergraph product (HGP) code'
 short_name: 'HGP'
-introduced: '\cite{arxiv:0903.0566,arxiv:1202.0928}'
+introduced: '\cite{arxiv:0903.0566,arxiv:1202.0928,arxiv:1810.01519}'
 
 alternative_names:
   - 'Quantum hypergraph (QHG) code'