NGOC LONG, Hoang; 						VAN VIEN, Vo; 						HOA BINH, Vu.
 Effective Couplings between Two Photons and Axion  in the 3-3-1 Model.
<strong>VNU Journal of Science: Mathematics - Physics</strong>, [S.l.], v. 37, n. 4, dec. 2021.
ISSN 2588-1124.
Available at: &lt;<a href="https://js.vnu.edu.vn/MaP/article/view/4627" target="_new">https://js.vnu.edu.vn/MaP/article/view/4627</a>&gt;. Date accessed: 07 may 2024.
doi: <a href="https://doi.org/10.25073/2588-1124/vnumap.4627">https://doi.org/10.25073/2588-1124/vnumap.4627</a>.