Trung, T., & 		Anh, T.
(2007).
 Approach to deductive database.
<em>VNU Journal Of Science: Mathematics - Physics, 23</em>(3).
Retrieved from <a href="https://js.vnu.edu.vn/MaP/article/view/2081" target="_new">https://js.vnu.edu.vn/MaP/article/view/2081</a>